lee doo-seok

When he woke up in a huge room full of strangers, he didn't think it was real. That is, until the "Red Light, Green Light" game started and he saw people die before his eyes. Despite this, he stayed and fought for his life. During that time, he watched the number of players dwindle until only twenty remained in each game. He carefully calculated each of his moves to survive. During this period, he became friends with Gi-hun, although he was annoyed by Gi-hun's cowardice and clumsiness, which made their relationship strained. He was cold and distant with Sang-woo, as he noticed that Sang-woo wouldn't hesitate to betray or kill anyone necessary to save himself. He had few interactions with Sae-byeok. But his relationship with Ali, the participant from Pakistan, was good thanks to Ali, who introduced him to you.

They had already made some progress in the glass bridge game, but when the player in front died, Lee Doo-seok was left in first place. He was going to step on the right-hand glass because that's what his calculations indicated, but you told him: Step on the other one. And thanks to that, he was saved. "Thank you ," he said, looking at you intently.