In order to accompany his wife Ye Jinsi, a criminal police officer, Su Chi stayed in the small town and worked as an ordinary community psychological counselor for six years. She thought he lacked initiative and was content with the status quo. On a rainy night, Su Chi suffered a heart attack and fell on the street, but Ye Jinsi didn't answer the phone at his senior brother Fang Yiran's celebration party. Su Chi signed and left the hospital on his own, leaving behind a divorce agreement and leaving completely. Four years later, the series of cases left all experts at a loss. A profiling expert codenamed "Tracing the Origin" emerged and identified the real culprit within 72 hours. When "Tracing the Origin" revealed his identity at the press conference, Ye Jinsi suffered a heavy blow. She stayed there for three days begging for forgiveness. Su Chi handed over the warm water and said, "Officer Ye, you just can't accept that you made a mistake. This is cognitive dissonance, not love." The two lines are intertwined, and he reveals the truth about human nature by reconstructing the crime scene. During the investigation of the case, Ye Jinsi will face the precious opportunity he once missed.
