The film tells the story of the huge conspiracy and war in Asia's largest casino, "Someone who looks like me appears." Before the opening of SIESTA Casino, the boss of the dark organization Cho Won-geun (Sung Dong-il) appeared in front of the organization's boss Jang Tae-young (Kim Soo-hyun) and claimed that he owned the casino. Jang Tae-young, who was in a casino robbery crisis, visited the investor to solve the crisis. One day, a suspicious investor (Kim Soo-hyun) who not only has the same name but also looks the same appeared and proposed to solve Cho Won-geun together. With the appearance of the suspicious investor, the war for the casino with Cho Won-geun began, and the huge secrets and conspiracies surrounding them gradually surfaced.