Choi Hyung-wook (played by Liu Haizhen) is an experienced killer. He can always complete all the tasks assigned to him perfectly. One day, after doing a big deal, Choi Hyung-wook came to the public bathroom to take a shower, but he fell down because he stepped on the soap and fell into a coma. At this time, the unknown actor Yoon Jae-sung (played by Lee Joon) who had been secretly observing him on the side stole Choi Hyung-wook's cards and took the finances in his cabinet for himself. Choi Hyung-wook, who woke up in the hospital, lost his memory. With the exchanged cards, he thought he was Yoon Jae-sung, and the two exchanged identities by mistake. In order to survive, Choi Hyung-wook started doing odd jobs. He was appreciated by the director because he showed excellent physical fitness and fighting skills on the set. On the other side, Yoon Jae-sung discovered Choi Hyung-wook's identity as a killer and developed feelings for his next target, Song Eun-joo (played by Lin Zhiyan).