When Jiang Linglong was investigating a mysterious disappearance of a young girl, she met Pingcheng Young Marshal Gu Zhanbei. With Gu Zhanbei's help, Jiang Linglong successfully solved the case. Jiang Linglong was impressed by Gu Zhanbei's ability and kept him in the detective agency to form a detective CP. After the second case was solved, Gu Zhanbei realized that he and Jiang Linglong seemed to be involved in a serial murder case. At the same time, a conflict broke out between Jiang Linglong and Gu Zhanbei. The emotional entanglement and the old case from ten years ago, and the black hand hidden behind it, all put them in a huge crisis.