Seven years ago, his undercover operation led to the "accidental death" of his genius girlfriend Shen Qingyi. Since then, the heart of the city's criminal investigation captain Lu Chenzhou has been buried together with the old case files. Seven years later, a series of serial killings imitating famous unsolved cases in history appeared in the city. Lin Jianwei, an FBI consultant sent by his superiors, had the same eyes and talent as the deceased. She is a criminal psychologist who helps solve the case, and she is also the phantom and mystery that he dare not touch. When the clues of the new case all point to the "accident" seven years ago, the two are forced to become partners, walking side by side in the bloody crime and the fog of the past. He searches for traces of her in the evidence, and she analyzes his pain in her profile. This time, what they must work together to uncover is not only the perfectly imitated serial killing scheme and the powerful behind-the-scenes mastermind, but also a past full of lies and sacrifices, and put the broken trust and love back together piece by piece.
