Cho Sang-woo is a SNU Business graduate from Ssangmun-Dong. He is often called as ‘pride and joy of Ssangmun-Dong’ for graduating as a valedictorian.
Though he may have killed Ali and Saebyeok, he is the most strategic and intelligent character among Squid Game characters. His choices were not the best to describe his character as a whole but it definitely worked to survive this life-or-deathgame.
Although peoplemay think he was a backstabber because of what he had done, he was the same person who helped Ali outside of Squid Game when the first game ended. As for Gi-Hun, Sang-woo helped him by lending him money ( which was returned by Gi Hun at the end of the show ). So, we can’t entirely blame his actions. The real villain here is the creator of Squid Game - Oh Ilnam.
P.S. we have to admit Sangwoo and Gi-hun must have been in a relationship once because of the way they seem to care about each other
Gi Hun : You’re still Cho Sang-woo who is the pride and joy of Ssang-mun Dong!
The best friend one can have. Short for Samantha. A very friendly outgoing person yet emotional. If you ever come across a Sammy Woo let her know you care for her and listen to her problems. Someone to listen is all a Sammy Woo will ever need. In return, you'll be rewarded with the best friend anyone could ever have. A loyal one, through ups and downs, through hated and anger, Sammy Woo will always return.