The continuous pursuit of a murder case of 10 years sheds light on the darkness of human nature and unravels a well-planned revenge. Feng Lang (Wang Qing) is an intelligent criminal detective. Through multiple cases, he unearths a shocking conspiracy involving a pharmaceutical factory many years ago. Together with young policewoman Fan Yun (Li Xinran) and other investigators, they engage in a battle of wits and will to solve the mystery.
