Ji Beichen is the youngest deputy captain of the Criminal Investigation Detachment. He has a 100% case detection rate, but he has a secret that no one knows - there is another personality "A Shuo" living inside him. Ah Shuo is calm and cruel, and is good at thinking from the perspective of a criminal. Whenever the case reaches a deadlock, Ji Beichen needs to "replace him." However, while investigating a serial disappearance case, Ji Beichen woke up and found that his hands were covered in blood and a strange corpse was lying next to him. All the evidence pointed to him as the murderer. What's even weirder is that he has no memory of what "A Shuo" did during this period. Did he lose control and kill someone, or was someone setting him up? When Ji Beichen began to investigate the truth, he discovered that the conspiracy behind the case pointed to the deliberately forgotten memory of his childhood. And is the voice that has been talking to him in his head really his other personality?
