Jiang Nan, who was trafficked when she was young, has always wanted to find her biological parents. After graduating from the police academy, she returned to her childhood hometown of Xichuan City to work. As soon as she started working, she was assigned to investigate a falling case. His immediate boss, Zhang Ao, is the head of the Criminal Investigation Detachment of Xichuan City Public Security Bureau. He firmly believes that the falling case is related to an old case, and an investigation begins. But the deeper they dig, the more confusing the case becomes, and it even points to the relatives Jiang Nan is searching for. Distinguish black and white, but find that everyone is gray; find out the real culprit, but find that it is beyond reach. Do you want peaceful prosperity or the cruel truth?