Criminal investigation captain Lu Chen discovered that his talented portraitist partner Lin Zhou seemed to be a different person every night. When the serial murders overlapped with the disappearance of a girl fifteen years ago, the second personality "Night Owl" in the cracks in Lin Zhou's memory gradually surfaced. Lu Chen must keep the legal bottom line while chasing the murderer, while holding on to his partner who is wandering on the edge of darkness - "Whether you are Lin Zhou or Ye Xiao, you are my accomplice.
Mission: The law has standards and protection has no boundaries