Gu Chu, a medical student who had to interrupt her studies due to a family change, returned to school after several years of social experience, wanting to complete her studies and her original dream. During her graduation internship, she met Lu Beichen, the chief forensic doctor of the Forensic Center, and Lu Beichen's other identity was the twin brother of Gu Chu's deceased boyfriend Lu Beishen. Gu Chu tried to get along with Lu Beichen with complicated emotions, but Lu Beichen was prejudiced against Gu Chu because of his brother's death. The two gradually let go of their knots while solving one case after another. Just when they thought they could start over, the conflicts between brothers and two families stood in front of them. In the end, justice defeated evil, love influenced everything, the truth made the murderer nowhere to hide, and the love between the two people also came to fruition.