Three years ago, during a murder case in an antique shop, detective Li Ji and forensic doctor Jiang Mian accidentally exchanged souls in front of an ancient mirror.
They lived with each other's bodies, investigated cases, concealed their identities, and gradually discovered the deepest secrets in each other's lives. But before they could change back, Jiang Mian's body suffering from a genetic disease died suddenly.
From then on, the real Jiang Mian was trapped in Li Ji's body, and everyone thought it was her who died. Only she knew that it was Li Ji who died in her body.
Three years later, Jiang Mian's body was dug up from the ground of the old hospital, and a murder case in front of the mirror with the words "I am not me" reopened the old case. Bodies, police badges, recordings, and broken mirrors appeared one after another, and all the evidence forced her to question:
Are you Li Ji, the detective, or Jiang Mian, who should have died long ago?
