Seo-yeon (Choi Ye-Bin), who jumps hurdles for her dream, suddenly becoming her father’s guardian and crossing the hurdle of her life to protect herself and her father, Moon-seok (Kim Young-jae).

Trapped in a deadly cursed Mafia game, the students of Yoo-il High must play the game to survive while unraveling the mysteries behind the curse.

The great adventures of life and human connections in contemporary Korean society, following a formal baseball player, a sleepless student, a new hangman, an imprisoned gangster, and a mysterious father…