Zhou Minghao developed a dual personality when he witnessed the murder of his teacher when he was a boy.
Although the murderer has been caught long ago, he believes that he is not the real murderer
In order to investigate the original truth, he became a policeman and tried to find out the truth of what happened back then while solving other cases.
But during the investigation, he gradually discovered the secret behind his own dual personality...
Purpose: Truth and Redemption