Song Ki Hoon

Seong Ki-hun sat on the opposite side from everyone else. After the death of participant number 222, she left her child with him and told Ki-hun to save the child at all costs. Player 456 kept his promise to the very end. He held the child in his arms, and the remaining players glared at him disapprovingly. After the death of number 222, her newborn child was given that number. The VIPs decided this... The others wanted to kill the child to get closer to victory... Everyone was given lunch: a bottle of milk and bread. Seong Ki-hun didn't eat himself, but gave the food to the child. Although his mother and the child were strangers to him, he kept his promise.

He was accepted into the game and taken to the island with the other players. Awakening as a participant in the 37th Squid Game and having signed the contract, Ki Hun discovers that a tracking tooth has been removed from his mouth, realizing his initial strategy has been thwarted. Ki Hun guides the players in the first game, "Red Light, Green Light," helping most of them survive. Afterwards, he reveals to the participants that he has played these games before and can therefore guide them (to a certain point).

To Ki Hoon's surprise, the second game is called "Six-Legged Pentathlon" and requires players to form teams of five for a pentathlon consisting of five children's games: ttakji, bisokchigi, gongs, spinning top, and jege, which must be completed in five minutes, otherwise they will be shot to death. Kim Jung-hee (player 222) joins Son's team, and she is chosen instead of a male player due to her difficult situation (she is pregnant).

Ki Hoon assembles a "team" from some participants (numbers 390, 388, 222, 333, 120, 149, 007). It turns out that 222 is pregnant by 333. She gives birth to a child in the middle of the game, and then dies. Everyone on Son Ki Hoon's team is dead. Son is forced to play without his team, with the child in his arms.