Yisoo Baek, a federal informant, and Dogyeong Baek, the boss of a criminal gang, are twin brothers. With the same faces, the twin brothers have lived different lives until now. Yisoo, who's been betrayed by the gang of fellow informants with his former boss, throws away his identity to become his brother after his brother Dogyeong went into coma after the attack. This federal agent is soon to become the gang's boss...!