In order to solve a large-scale theft of national treasures, criminal policeman Zhao Hongyu (Jiao Junyan) went undercover with his partner Shao Kuancheng (Song Yang) to investigate the current wife of his biological father Wan Zhenggang (Fan Wei). Just when the case was about to be solved, this batch of national treasures disappeared under the close surveillance of the police, and Lin Baiyu also suddenly disappeared... Wan Zhenggang, a professor of history, was suspected by the police. As a daughter, Zhao Hongyu was determined to find her father to find out the truth, but unexpectedly fell into a bigger crisis. Was it a tragedy caused by the husband and wife turning against each other? Or was it a sudden attack when the father and daughter were reconciled? Under Shao Kuancheng's investigation, as the truth surfaced, it was a real game about human nature...