You Mingxu, a female detective from Jiangrong City, went deep into western Sichuan to investigate a serial murder case. She met Yin Feng, a criminal psychology professor who was injured and had amnesia, and the two formed a detective partner.Yin Feng, who had lost his memory, returned to his boyhood, innocent and enthusiastic, and walked into You Mingxu's closed heart due to the loss of his mother at a young age.In the process of handling the case, Yin Feng showed excellent criminal psychological analysis skills, while You Mingxu relied on many years of experience in handling cases and keen intuition to solve the case repeatedly with the help of Yin Feng. The two went from strangers to tacit understanding, and gradually became familiar with each other.Falling in love with each other.Yin Feng also regained his memory. He looked cold on the outside but was still full of feelings for You Mingxu on the inside.But Yin Feng deduced that his brother might be the murderer of You Mingxu's mother.In order to solve the mystery of the death of You Mingxu's mother nineteen years ago, the two of them worked hard to uncover the truth that had been sealed for many years and finally revealed the real culprit.