Reactors Reaction To Sang-Woo Going After Saebyeok On Squid Game Episode 8 | Mixed Reactions
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- เผยแพร่เมื่อ 15 มิ.ย. 2024
- Reactors reaction to Sang-woo going after an injured Saebyeok, at the end of episode 8 of Squid Game
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Gi-Hun had very good character development. He went from disliking the pick pocketer to begging for the guards to treat her injuries.
and unfortunately all that development crumbled when he decided to not go on the plane to be with his family. Absolute garbage ending imo
@@Luke-cu7bf nah now he can avenge the dead and end the squid games once and for all
@@Luke-cu7bf I wouldn’t say that ruined his character development. It actually emphasizes it. But I do agree with it being a mediocre ending; I feel like the only reason they did that was to keep it open for season 2.
@@Luke-cu7bf it didn't, he just wants the whole thing to be over
@@Luke-cu7bf Oh cry me a river
The saddest thing about Sang Woo is the more we watch him, the less he hesitates about resorting to violence and deception. The first few episodes, it’s clear he does feel bad and has that hesitation. But as we go on, the more he loses more of himself and the more he gives into that darkness that we were warned about in the first episode.
His descent into darkness is one of the best things of this season.
I think it perfectly mirrors his actions in his old life. The writing in this show has so many layers.
@@nuncapasaran9374 I mean the show did warn us at the beginning he's not a good person.
@@sophieamandaleiton-toomey8469 he is not a good person for trying to win a life and death game ? Idk but that's what I loved about his sacrifice at the end, everything he had in his mind was his mom, no matter what he had to do to survive. In my opinion i think he is a great character with a lot of layers to him, also a very realistic one since there's a ton of sang woo's in the real world.
@@shrmpizza8660 No I'm not even referring to the game itself. The show warned us he's not a good person when they explained at the beginning he stole from his clients and even stole from his mom.
And don't get me wrong. Sang Woo is one of my favorite characters. He's so incredibly complex and layered and I went from absolutely hating his guts to sobbing as hard as Gi Hun as he begged for him to help his mom.
@@sophieamandaleiton-toomey8469 oh alright i get you better now and you're completely right about the show giving us warning signs, ever since i saw him about to commit suicide i also knew he'd do anything to win that game
Every reaction to Sae-Byeok's murder was appropriate. First anxiety that Gi-Hun would get stabbed in the back, then a little hope when the lights came on that the guards might save her, followed by despair that they came in carrying the box of death, then absolute anger and rage at the realization of what Sang-woo had just done.
IKR,it’s not like those fake reaction channels (well the only reaction channel I like is Dwayne N Jazz IMO)
Exactly
Reminds me of a certain execution from a game
Sang woo was playing the game using his head.
Gi-hun was using his heart.
That's why he was South Korea's number one star pitcher. No wait fuck wrong show.
That's the best way to put it, i love this
Exactly
People say he's a piece of shit but when you down bad needing money to provide for your loved ones anything goes
Lee Jung Jae's (Gi-hun) acting here is superb. The rage, anger and sadness are mixed in one. I hope he gets an award for this.
Edit: so happy to see JJ won Sag and critics choice awards. I am so happy for him. 😃
He had mixed reactions
Totally agree. Made Gi-Hun my fave character, such a phenomenal actor 👏👏
This show just got nominated for 3 category at the Golden Globes.
@@sifu2u_now And critics Choice award and I will be back here once my dude take home any of these awards. Or if he is nominated for SAG and Emmy.
He is a veteran and a very respected actor in korea
Sangwoo was FUCKED UP but one thing I’ll give him credit for was that he knew how to play the game and boy did he PLAY it
Thing is, Sang-woo isn’t fucked up. He’s a normal guy who has rationalized doing fucked up things. He hates all this, and he’s probably scared of what he’ll do next.
It’s easy as audience to be an armchair critic, as we all were. But I am certain Cho Sang-Woo knew this game would only have one winner right from the start and for his mother’s sake he was doing his best to survive.
@@MonstrousEthicist You’re damn right!
Sang Woo is the type of guy that would abuse his own mother. Of course he was going to be all in.
@@scottlette there can be multiple winners actually
The scariest part about Sang Woo is, if we were the one's put in the game, you'd think you would be someone like Gi-hun, but Sang Woo is what you'd actually be.
exactly.
Exactly people think they are Seoung Gi-hun but everyone's Cho Sang-Woo from heart. And that's what makes Sang-Woo the most realistic character.
It was at that moment, Sang-Woo, as realistic as the situation(s) is, became a really despicable character.
Props to the actor who played Sang-Woo in this series. Massive props.
Nah, that happened when he got Ali killed.
When he got Ali killed, he became irredeemable to me
Park haesoo
The actor truly is brilliant. He brought the complex concept of 'refined depravity' to life if there is such a thing. He starts off seeming refined and suave and concludes as the actual worst entity to happen to the group of protagonists. A true embodiment of all the tragedies the show surmises.
Sang Woo was always a POS from the very beginning really. He bristled and cringed at someone from his past seeing him in his current state and was willing to sacrifice him to hold onto the knowledge he held about the sugar game. A completely unnecessary move.
Sang Woo's descent into madness is one of my favorite parts of the show.
Madness? He was all the time logical and ruthless. He did what was needed to be done to get to the goal. Like a good business executive
@@orlandocarrillo7132 Logical at the beginning definitely. But as the game went on, he stopped relying on logic and dove completely into ruthlessness.
@@sophieamandaleiton-toomey8469 kinda agree
Sang-Woo effectively won the game right then and there when he killed Sae-Byeok. With that single kill, he ensured that the last man standing was going to be someone who cared about his mother.
Also "is he a villain or is he just playing the game" is exactly the question we ask about capitalism. We accept the rules because that's the world we live in, but we are numb to the brutality of it and villainous actions are blurred by the "you're first or you're last" mentality. Remember Sang-woo did some kind of massive scale financial fraud back in his old life, so he was already basically this venture capitalist dude and willing to fuck people over to win. I think the show does a good job of using his character to show who wins and who loses and what the stakes are in a world where no one cares about anyone else.
THANK YOU. I wanted this kind of comment.
not 'he's not villain or i hate him' stuff.
Very true
Everyone: "SAVE HER! SAVE HER! SAVE HER!"
Sang-Woo: "So anyway, I started stabbing."
He didn't stab her
@@deez-px1iu It’s a joke, buzzkill😑
@@talulat4185 no shit but I couldn't tell if they were serious
@@deez-px1iu “ You couldn’t tell they were serious?” What sense does that make?
@@talulat4185 I meant if they said stabbing on purpose even if they saw her neck got cut you don't need to make this a twitter argument
I think the most depressing thing someone pointed out to me in this episode is that Sang-woo has blood on his face and shoulder. You'd think it would only be on his sleeve, but the blood on his upper torso probably meant Sae-Byeok with her last bit of strength tried to stop him.
Could be wrong, but his entire outfit was clean prior to this during the entire dinner scene, so... yeah.
Every time I revisit this video people like you give me more reasons to cry.
wow it makes sense
That could be true, but since he stabbed her in the neck. It’s very likely he hit an artery and when he did it just sprayed on him. Especially since the blood seems to one be sprayed on the side he used to stab her. With very little on the other. Which would be consistent with just a blood spray from an artery puncture. Though that is depressing to think about if it’s true.
Sangwoo just played the game, the real villains are the VIPs who really needs a lot of acting lessons.
Bruh fucken right
No because they came on their own
Lee Felix, acting lessons lol bruh you act like they supposed to act all seriously and shit😂
@@bruhhh8326 choice was an illusion dude. VIPs knew they would come back
The more I watch this scene, I notice as soon as the lights turn back on, Gi-hun does a 180 and looks around but doesn't notice Sang-woo standing over Saebyeok. Still an amazing scene tho lol
Yeah, that was a suspension of disbelief moment. I know if I was in Gi-hun's place, I would've looked back to Saebyeok when he turned to look behind him. Purely there to deliver the surprise at the right moment from a cinematic perspective.
I LITERALLY THOUGHT ABOUT THAT TOO WHEN i WATCHED THIS TODAY! Like, you turned around for a sec and didn't see him then?
Indeed. The only explanation I can think of is that he did see Sang Woo move over to see what happened to her because he didn"t know of her wounds as well. and in his panic Gi Hun didn"t consider what could happen. It was only until he saw the casket being brought in, that he realizes what had happened.
maybe his eyes were still adjusting to the light lol
he's clearly looking up at the lights coming on, not down at the bed.
You know what crazy about this? There’s gonna be SG fans that straight up hate Sang-Woo and then there’s probably gonna be other SG fans that are like “Sang-Woo did nothing wrong”. 😂🤣
LOL NO CAP!
Sang Woo is just like Thanos, a well written character
I mean he just played the game 🤷🏽♂️ he was smart
i dont condone it, but he did what he did to survive. he will sacrifice anyone to get the money for his mom, including himself.
SANG WOO DID NOTHING WRONG, FREE MY BOY! 😤
Sangwoo is so well written that when everyone see him standing there from afar after seeing the coffin. Their first reaction was that he kill her not him getting up to help her lol
now you mention it, you are so right lol. There is no doubt in anyone's mind that he killed her off.
You know he's a good actor if he managed to piss you off.
Sang-woo is such a well fleshed out character. He was willing to betray his humanity to achieve his goal. A lot like Thanos. Sang-woo only got this far because he wanted it the most. More than anyone else. Thanos tossed his only thing that he saw was a daughter off a cliff to achieve his goal. He definitely has done some detestable and inhuman things but he really should have won at the end imo.
He shouldve in reality but people would be upset watching the show
Thanos is inhuman because he isn't human.
That's a good point, but I would say that while Sang Woo shares the same level of conviction and practicality as Thanos, they have different motivations. Sang Woo sacrificed 3 people he barely knew, and then himself to help his mom. Thanos sacrificed his daughter so he could carry out his misguided plan and prove his people wrong. At least Sang Woo had a moment of realization at the end that he had done too many horrible things to live, so he killed himself giving Gi Hun the win. Thanos believed his own lies until Tony killed him. I would say that Il Nam was more like Thanos. Il Nam lost or left his own family in favor of the games, because he was bored and wrongly believed people are all innately selfish.
He was pragmatic. Ruthless. As a good business executive
He’s not that deep of a character in my opinion
I love how when they see the casket they are like no(😭) but just a second later when they see sang-woo they go no!(😡)
If Sang Woo doesn’t kill her then they could’ve ended the game with a majority vote. It’s brutal strategy but they have come too far for it to end.
Exactly!
Sang-Woo knew there couldn't be a Third Wheel to this family moment.
The way they revealed Sang-Woo standing there with long shot is brilliant. Hollywood probably would've cut to close up of Sang-Woo opening his eyes and slow motion of him moving in to kill.
The guitar though. The music is what makes this scene more emotional. You can feel the tragedy.
That girl's acting is so on point that the planet has been hit hard by her exit!
Half of the girls sounded like they wanted to speak to Sang-Woo’s manager
…What?
bruh i'm in stitches
Lmaoooooo 😂😂😂
lol
I'd like to see your Front Man, please!
Bro this scene killed me. I wasn’t done simping 😭
It killed Saebyeok too
That part was inexpected but was shocking and amazing at the same time.
This is the moment that truly solidified Sangwoo as a villain. I know many people are arguing over it being when he betrayed Ali, and as terrible as it was for him to take advantage of Ali’s kind and trusting nature, it was still during one of the games. It was an either he dies or I die moment. Still bad that he betrayed his friend but it was a means of survival. This moment here, however, was what made him a villain because he honestly did not have to do that to Saebyeok. She was already unconscious and bleeding out, she was going to die anyways, so there was zero reason for him to kill her.
I fucking love mixed reactions. I only saw squid games last week, immediately watched pReview’d reactions, then was surprised mixed hadn’t put up any videos yet. Was anxiously waiting for this one, and it was worth it. Was hoping to see RT TV on there. Now if Struggle Nation can put that shit out, that’s the next one I’m waiting for.
I went through the full emotional spectrum in that few minutes man. Urgency, hope, despair and fury in quick succession. What a season. Already buzzing for Season 2!!
poor saebyeok...she did all of this to keep her family together, she tried hard
The acting from the lead really sells the grief!
Such a fantastic show and the actors absolutely blew me away, the only bad thing about this show is the actor who played Sang-Woo is gonna get so much hate focused at him just because some people cant seem to fathom that he isnt actually Sang-Woo.
Not really, for kdrama fans he still more popular as the innocent Kim Jae Hyuk from Prison Playbook... This drama can't change that iconic act from him, at least not for me....
@@iekha_triples7718 Im sure thats true for kdrama fans, but im thinking more about everyone else in the world.
Sang Woo was my most favourite character even tho he killed other mains, simply because he was the only practical and logical character in the show. He knew there was no other way round
Unpopular opinion: Sang Woo put Sae Byeok out of her misery. He basically helped her. Why would he not have just gone for Gi Hun for an easy victory? Clearly an act of mercy.
12:49 the disappointment in his voice made me laugh for a reason lol
They are killing sangwoo by words🤣
The one thing about the characters in this show that i have to realize and remember is that...ALL OF THEM CHOSE TO GO BACK! At that point, they had to know what they were getting into. How high of a price they had to and were going to pay. Even if they didn't, just the fact that you are making the conscious decision to go back into a game where if you lose you're going to die should be enough. Children's games or not, you're competing with your life at stake just to get some money. Yes, some had issues with gangsters and loan sharks. Others needed to get out of debt for their own reasons. But this whole thing in it's entirety is about risking your very life to get MONEY and YOU'RE GUARANTEED DEATH if you don't pass. It's not like if you lost you get to go home. All these people were being sentenced to death the moment they went back in and as the saying goes, "Died trying". There's no way I would EVER go back in if I managed to survive and GET OUT. The series itself is compelling. We as the audience root for who we want to make it out. But as a whole, the whole thing is just dark. You mean to tell me death is the final option if someone loses? You can't just, silence them to a lifetime of secrecy? LOL. It's like the Hunger Games almost. Though children having to kill each other is JUST AS BAD and unlike the characters in Hunger games, where they didn't have a choice but to go, everyone in this show had a choice.
Recommended to everyone who hate Sangwoo to watch Prison Playbook, so that the guy who played Sangwoo can redeem himself....lol...
Saebyeok's not dead. She's just acting. Lol
🤣
Bruh fr
Nope. Ho-yeon is acting, sae-byok is dead.
No shit
Whew
This show had my anxiety up the WHOLE time.😳
If I'm the only one who likes sang woo Ill be surprised
You’re not the only one
my favorite is the one who was mad at Sang-woo and then his name showed up on the screen in really pretty script lol
I understand how they hate sang-woo but in any situation like that you need to do everything in order to survive
That blond girl is just too sweet for the show I think… poor thing was in tears the whole clip.
If you want what I think.
I think she was faking it
The real villains remain the VIPs.
I like the changes from a sad 'nooo' to an angry 'NO!/WTF'
As someone who's favorite character was Sang Woo, this scene was the ultimate test to get me to dislike him. It failed, but man I was mad lol
As much as I hate Sung-woo for this, his logic is sound. The two of them (Gi-hun and Sae-byoek) could have voted to end the game to save her. He had to kill her to preserve his chance at the prize.
He could've just gone to kill Gi-hun while he had his back turned and made it even easier for him by going up against the injured Sae-byoek in the finale.
@@miyol9766 oh right, i didn´t thought about that!!
@@miyol9766 I mean... Gi-Hun is he's childhood friend, perhaps he chose to fight his childhood friend in the last battle
@@miyol9766 gi-hun was further away and required less challenge to kill
@@miyol9766 it's too risky to go to kill Gihun, I guess
S u n g woo was already awake he was just pretending to be asleep
This show is such a roller coaster.
Sangwoo doesn't even have to do anything and just stand next to Saebyeok's lifeless body and everyone already knows what happened.
People! The reason why Sangwoo had to kill her is that he feared that the two would make a deal to stop the game and get out of there.
Just me respecting all reactor for not watching in dub..cuz the emotion is full when u watch in korean
This series was written brilliantly. The emotions it carried
He did it to survive goddamn it.
She was defenseless, that makes me angry af. Homegirl would’ve punched Sang Woo in the face if she was not in the blink of death.
Why the thumb call him "the real villian?" He was just to survive like everyone else, with his strategies.
The real villain was the old man lol
@@ShadowHoodKnight nahh
This was one of the most unnecessary murders, she was already basically dead
@@ShadowHoodKnight exactly. But the thumb call one of the victims "real villian"
@@GoCrazyBaby3 she was bleeding to death, he ended her suffering. He even explains it. She had a pretty fucked up wound and obviously that hurt her, not to mention the symptoms of someone bleeding out. At the end he was trying to survive too like everyone else
I actually didn't hate sang-woo until he killed her, I mean everything else was just him trynna survive like everyone else but killing the girl just upset me. We all knew that she was gonna die anyway so doing that just seem uncalled for not matter his reason
Even if she was gonna die anyway, they had enough time to do a majority vote to terminate the games. Sang woo knew what he had to do to prevent this. Yeah he wasn't gonna die from it, but imagine coming this far just to lose all the money because of a girl who is gonna die eventually.
I hated Sang-woo the second he betrayed Ali
@@viruspyt Yeah I know why he did it...I watched the show. I feel like they just did that so that they could solidify him as a villain. The moment the mc was started asking for a doctor I knew she was already dead. The reason why no everyone hated sang woo after that even though he was just trying to continue the game was bcuz there was actually a chance she could have survived.
he was not a villain he did what he had to do to survive
the thing is, sang woo isnt exactly a villain. Hes us when given knives and theres money involved.
38 million dollars or nothing
Gotta love how a lot of people comment on justifying Sae-Byeok's murder. Yeah, we get it, you were rooting for Sang-Woo all along because he "knew how to play the game".
When all was said and done, the real reason she couldn't go on into the last episode was because she wasn't the main protagonist (nor his close friend). Not to mention she plays a North Korean.
She was easily my favorite character BAR NONE. I honestly didn't have any significant emotional reaction to any other character's demise besides hers (and the girl she played the marbles game with).
I didn't even understand the reasoning for blowing up the bridge at the end of Episode 7 just as the three players reached the platform. You knew it was inevitable that they'd be hit by the glass shards, and of course she got the worst of it. The game itself caused her injury, and put her at the immediate disadvantage for the next game.
i love watching people angry, maybe from now i'll start making people angry and watch them 😗
Lol people mad but won't admit that they'll be doing the exact same thing in sang woo's position lol the most realistic character in the show and they're mad at him for it.😂
Mans is speaking facts
I think you’re projecting a bit, I know for damn sure I wouldn’t have done Ali and Sae-Byeok like that
@@SovaSpooks IKR,they’re not necessarily mad he killed her,if anything they’re mad because 1.Sang Woo killed her while his friend’s back was turned and 2.He killed her in a very,VERY brutal way.
@@REDACTEDrose184 exactly, and also the fact that she was gonna die anyway so killing her in the way that he did only made him look more like an asshole
@Dre Thomas. How was he gonna know that especially when gin literally found out before knocking on the door
I never actually really liked the girl, but holy hell I loved Sang Woo. This moment made me respect him even more, he’s desperate and you can tell he’s willing to do anything. And I actually admire his choice to attack the already injured person and not Gi Hun who he could’ve easily ambushed with his knife. She was already losing a lot of blood and wouldn’t have been able to participate in the final game well. Props to Sang Woo.
Sang-woo: I'm not a bad guy, am just playing to win.
Everyone: POS!
I literally watched 20 mins same scene with different flavours
so much hate for Sang-Woo lmao greatest character in the show
"Sang woo you're a piece of" LMAOOOOO THAT TOOK ME OUT
Woo SHIESTY yuhhh
The moment Sang-woo officially became the bad guy, in my opinion, was when he did Ali dirty in the Marble game. But considering that Saebyoek was losing a lot of blood from having a large piece of glass in her stomach, it was kind of a mercy kill.
Couldn’t have agreed more pal!
No, he became the villain when he gambled his mother's livelihood away for some money. He confirmed that villain status when he didn't tell the others about the honeycomb game (which would have cost him nothing personally). He was a coward who didn't want to have to kill his friends himself, so he let them walk to their own deaths. He couldn't face his loss in the marble game with Ali, because he couldn't believe that some poor immigrant could be smarter than him, so he lied and hid. He was a coward though and through, and took every opportunity to fuck over other people if it meant he could get the money. He didn't get as far as he did because he was the smartest or the most fit. He got there because he was the most willing to send his friends to their deaths for his own personal gain. In other words, as the show explicitly states, there are only winners because there are losers (under capitalism), not because the winners worked harder.
@@MrRizeAG Hmm,interesting!
Sang-woo didn't know she was hurt so idk about a mercy kill
@@MsAntdawg31 Why do you think that (just asking BTW)
Every self righteous person tells everyone they aren't sangwoo... Til they reveal they are exactly sang woo
Sang Woo is who we all would be
Anyone notice that Saebyeok's death wasn't announced?
Hmm strange,maybe we couldn’t her it due to the slow motion and music,don’t thing I’m entirely right I could be wrong.
Anyone notice that the people’s death in lights out were not announced? How about half of the people in red light green light?
Need more mixed reactions of squid game! 🙌🏾
Imagine if Kang Saebyeok appeared in Season 2.
Possibly as a flashback because kang sae byeok was burned at the end of ep 8
BRUH HOW CAN U BE MAD AT SANG WOO
HE GRADUATED FROM SNU
TOP OF HIS CLASS TOO
Gi Hun's rage at the end of the episode... 😢
I really do feel sorry for Gi-hun in the show. 😭
Probably just me, but sangwoo seems the most realistic. He just wants to win, he’s selfish and will take anyone down if need to. That’s why I don’t believe people when the say they wouldn’t act like sangwoo. Because come on, humans are selfish and will act like animals for survival. It’s already been proven that humans will literally make themselves instinct by fighting each other.
the most painful and hard to bear scene during all squid game
if a character makes you hate them to the bone, it just means that the actor is amazing. i often watch shows and movies that i don't care about the villain.
Sang-Woo should be thanked instead of hated because we all knew that all those characters had to die anyway, and who else could kill them and not be hated? Sang-Woo did all the dirty work so that Gi-Hun can stay as the good guy because without Sang-Woo, they would have all died at the hands of Gi-Hun.
His reasoning for doing this is so cold blooded. He knew the others were onto him that he was a real POS so he felt he had better odds of winning in a 1v1 then a 2v1 or 1.5v1 rather.
I like double shocks reactions here... hahaha
Number 7 is exactly how i reacted lol
Has anyone ever wondered if, because of how smart he is, already knew she was going to die, and instead of prolonging it did it himself so she wouldn’t suffer anymore? Or do you think it’s a reach?
He killed her to outrule the possibility that sae byeok and gi hun decide to stop the game on a majority vote.
-People: Shocked, sad &/or even crying.
-Me: ..."Crystal generation"...
Sae-byeok was my favourite 😢😭💔
9:21 LMAOOOO
Sang Woo was a villain from the moment he committed fraud but I think the was driven by the fact that he put up his mother's business and the shame it would bring had he been found out.
Lupasan got covered by vid time on thumbnail lmao
“why did i have to be right :(“
Early
My heartstrings are getting loose 🥺and my blood is boiling 😡
Even if Sang-Woo went ahead and kill Sae-Byeok off, she's never gonna last till the last round in the first place, seeing that she's been losing a lot of blood prior.
I don't think Sang-woo isn't a bad person for what he did in the games.
I think Sang-woo is a bad person for what he did before the games.
In the games, all these actions, as heinous as they might be, can be understood, from bamboozling Ali to clapping Sae-byeok. You can tell from the beginning episodes Sang-woo isn't too keen to get familiar with even members of his own "team" because he realizes the gravity of the situation and that he would be responsible for killing other people by merely participating in the games. The tug of war for example, it wasn't as direct as stabbing someone in the throat but they did drag the other team off the ledge to their deaths. The first game was Red Light, Green Light. The players weren't playing against each other they were playing against time. Easy. Same with the second game, which was the honeycomb cut-out game. Players weren't really playing against each other but Sang-woo had flashbacks that indicated he predicted the game before it was announced and he withheld it from his teammates (he almost stopped Gi-Hun from going Umbrella but changed his mind at the last second and said nothing). I think the actor for Sang-woo did a really good job of portraying the internal conflict in the character. The third game was the tug of war, which yes, the players did not directly kill the other team but it was the first situation they got put in where it was a "us or them" type of deal. That's when players started to desensitize themselves from the situation I think. Sang-woo was pushed even further in the 4th game when Ali was going to beat him in the marble game. Again a "me or him" situation and his back was in a corner, so he did what he did and I think that desensitized him further. By the point of the 5th game, Sang-woo figures if he could betray one of the players he was closest to in the games, pushing some random guy into a tile to preserve himself was no real sweat. It still very clearly bothered him which is why he got pissed off at Gi-Hun for confronting him about it after the fact. Generally, if people do something terrible, and they KNOW they've done something terrible, they need to justify it to themselves somehow and when someone questions that justification, they get angry because they NEED that.
Take for example, TWD. Any time Rick would do something morally questionable and people would question him about it and say something like "you're not the same cop from S1", he would get pissed off and basically say he was in charge and the situation called for it because he needed to justify to himself what he'd done.
Anyway, so all these things lead to that moment where he kills Sae-byeok. He's so desensitized to his own actions because he's clinging to the justification that it's every man for himself and he doesn't want to die that killing an already dying contestant is the only logical solution within the frame of his own justification, which doesn't mean he isn't fazed by it. Notice how he has the "thousand yard stare" when Gi-Hun looks up at him, not looking at Gi-Hun or Sae-byeok or even the game facilitators or the coffin. Again, the actor does a really good job of portraying Sang-woo in a state of shock (knife hand shaking) while likely working out the justification in his own head as to why he HAD to do it and had no other choice.
So that's why he isn't a bad person for what he did in the games.
Before the games though, when he put his mom's business up as collateral for his embezzlement and fraudulent dealings... that's why he's a bad person.
TL:DR, Sang-woo is justifying what he's doing because he has to to keep his sanity and do the things he's doing to survive which is causing him to do worse and worse things but he's really a POS because of what he did to wind up in the games in the first place.
Hate him all you want but he played the game. Completely emotionless.
Sang woo killed her because he mentioned one time also before that she and Gi hoon would agree to stop the game. Sang woo is not a technically villain. He just was the most serious one on game and winning.