Hyung-Wook (Yu Hae-Jin) is a contract killer with a 100% success rate. One day, he goes to a public bathhouse and slips on a bar of soap. Paramedics, including Ri-Na (Jo Yoon-Hee), take him to the hospital.
Meanwhile, Jae-Sung (Lee Joon) is a fledgling actor. He doesn’t have any money and can’t even pay his rent. He decides to kill himself, but he first wants to clean himself up. He goes to a public bathhouse. There, he notices Hyung-Wook who is dressed well and wears an expensive watch. When Hyung-Wook slips on the bar of soap, Jae-Sung walks over and, on the spur of the moment, switches locker keys with him.
When Hyung-Wook wakes up at the hospital, he can’t remember anything about himself. He doesn’t even know his own name. From the items gathered from his locker at the bathhouse, he learns that his name is Jae-Sung. With the help of Ri-Na he is able to go to his shabby apartment. The two men adjust to their new lives.