Qiu Xinzhi is sick of the anxiety-ridden undercover life, but a missing-persons case once again lands him in a dangerous and confusing situation. He originally plans to pretend to be an undercover agent to solve the case, but he does not know that behind the complexity, a greater crime and conspiracy has already bared its fangs to him. To solve the case, Qiu Xinzhi relies on his wisdom to punish and eliminate evil. Ultimately, the suffering people are rescued and the mastermind behind the scenes is brought to justice.