Set in a fictional city, a story about solving crime through forensic science leads to a serial murder case from 20 years ago.
While assisting the police in their investigation and trying to reverse the case involving her father, female forensic doctor Song Anyan joins hands with hot-blooded detective Liu Zhiming (Joseph Chang) in their desperate search for the truth. Along the way, they cross paths with the mysterious Lin Xiaomei (Gillian Chung).