A serial killer is victimizing the city of Linghai so criminal police investigator Ji Fan , Captain Xiong Zhen Nan, and forensic doctor Zhao Qing Yan create a task force to launch an investigation. The case becomes complicated when Ji Fan realizes that the killer might be close to him and found to be related to an old case 27 years ago that leads back to his own family – his Ji Ting Shan and older brother Ji Ping who lives with him.