When grassroots police officer Zhou Chengbi was investigating a strange convenience store robbery, he accidentally awakened the "criminal investigation skill tree system" and unlocked skills such as "criminal profiling", "physical evidence tracing" and "interrogation micro-expression analysis". With his funny personality and system support, he counterattacked from the police station's "stab" to the serious crime team's "conspicuous detective". He successively solved campus poisoning cases, wealthy businessman's drowning cases in secret rooms, and transnational human trafficking cases. He gradually became involved in the evil network headed by Huo Jiuyuan, the leader of the "Black Shark Society". In the process, she gets entangled with the mysterious bar owner Su Chaoyun - she is both a key clue provider and the orphan of an unsolved case ten years ago. The two develop a secret love during the investigation, and eventually join forces to expose the shocking conspiracy between ghosts in the police force and evil forces.
