When Hee Joo (Sim Eun Kyeong) 7 years old, his father became a murder victim. His father is a detective who was in charge of solving a case. The killer, Gi Beom (Kim Seong Ah), eventually caught but was only charged with one murder case only. Fifteen years later, Gi Beom free from prison. Detective Dae Yeong (Yoon Je Moon) is responsible for handling the same case with the deceased father Joo Hee still has not given up in their search for ways to punish killers of former partner works. Meanwhile, Hee Joo waiting for the seconds freedom Gi Beom patiently.