Guan Hongfeng, a nyctophobic former police captain, returns as a consultant in order to discover the culprits behind the framing of his identical twin brother, Guan Hongyu, for familicide.

Guan Hongyu, who has been set up by someone else as a murderer of killing a family of five, starts the journey of sharing the same identity with his twin brother Guan Hongfeng (former commander of Jingang police station) in order to find out the real mastermind.