Forensic doctor Su Yan was forced to resign due to a "mistake" that led to the destruction of key evidence. Since then, he has curbed his career and worked as a humble pharmacist in a community pharmacy. She seems cold and distant, but in fact she is secretly tracing the truth of the "mistake" that year - it was a trap set by the hypocritical dean Shen Zhiyan in order to cover up the serial murders behind him. Psychologist Lu Yu met Su Yan by chance and was attracted by her sensitivity and calmness despite her seemingly "mediocre" appearance. He met her unexpectedly many times in cases. As a new serial murder case reappeared, Su Yan discovered that it was closely related to the old case, and decided not to hide it anymore, relying on forensic skills to peel off the cocoon. Shen Zhiyan sensed the threat and secretly set more traps. Su Yan, with the help of Lu Yu, dealt with the villain while exposing the truth. He counterattacked from a "defective forensic doctor" to the key to solving the murder case, and completed a change of destiny.
