He lost his parents when he was young and was living with his younger brother, Ryu Won, working part-time as the head of a boy. However, he suffered from school violence and was exploited by his part-time job boss. Then, with the start of the Death Game, his life changes completely. Afterwards, through his 99 regressions,He reaches the final round of 20, but fails because he is the only player left and the requirement for round 20 is 5 people. He eventually decides to aim for a perfect strategy based on the information from his regression as he enters the 100th time.