In his past, Byung Soo was a serial killer. He now suffers from Alzheimer’s. Byung Soo has a daughter, Eun Hee, but he actually took her from one of his victims. One day, he remembers Eun Hee's boyfriend approached Eun Hee to kill her. To protect Eun Hee, he fights to keep his memory and he plans to kill Tae Joo.