The Kim Yoon Jung kidnapping (and murder) case stirred up the media of the whole country. To calm people down, the government decides to abolish prescription for murder. Hence, a new cold case unit is created, lead by Cha Soo Hyun, and backed up by Park Hae Yeong. Their first official case is none other than the Gyeonggi Nambu serial murder case, the most famous of South Korea. (You can check Hwaseong serial murders for more information, it really happened.) Back in 1989, Lee Jae Han is looking for the seventh victim when he receives a call from Park Hae Yeong. By listening to him, he finds himself in the way of the murderer and changes the future.