Gu Yong-taek, a mob member who has been involved in criminal organizations since a young age, receives a new mission shortly after transferring to a different syndicate: "Protect a woman named Joo Yoon and make her break up with her boyfriend." However, just one week after Yong-taek is dispatched under the guise of a bodyguard, Joo Yoon breaks up with her boyfriend, effectively ending the mission. While trying to comfort a crying Joo Yoon, Yong-taek unexpectedly accepts her proposal to become sex partners. As they spend time together, the two gradually fall for each other. Gu Yong-taek! Is it love, or the organization? That is the question.