When Hee-Joo (Shim Eun-Kyung) was 7-years-old her father was murdered. Her father worked as a detective and was working on a serial killer case. The killer, Ki-Bum (Kim Sung-Oh), was eventually arrested, but found guilty for only one murder.15 years later, Ki-Bum is released from prison. Detective Dae-Young (Yoon Je-Moon) worked on the original case with Hee-Joo’s father and he has not given up getting a murder conviction for his former partner. Meanwhile, Hee-Joo has waited patiently for Kim-Bum’s release.