CHOI Ik-ho (Lee Jung-jae) is a rookie in the Ultimate Fighting Championship. One day, his brother suddenly disappeared. He was suspected of being targeted by the police for a false case. The police also determined that Ik-ho was suspected of murder and arrested him. Ik-ho received a strange phone call. The caller Ace (Shin Ha-kyun) is the manager of an illegal gambling place. He built his "GAME" with high technology and closed-circuit television to capture any small movements of his chess pieces. The special thing about GAME is that the chess pieces he uses are real people. It was Ik-ho's brother who was kidnapped to force Ik-ho to become their new chess piece. Ik-ho was asked to contact Su-kyung (BoA) and obey her command to rescue his brother. He needs to find his brother's location in the huge football field, and the fixed bomb tied to his ankle is always counting down. Ik-ho's breakthrough and approaching make Ace have to gamble everything. Between the two desperate men, the top competition is about to start. (Some spoilers are hidden)