by a man at the police station. "My mother rarely gets in touch." Her mother's body was found in a miserable state in the house after breaking the door open... The victim was Lee Hee-jin's mother, who is called 'Cheongdam-dong stock rich' and is imprisoned for illegal stock trading fraud. Her whole body was tied up and her head was hit several times, and her mother eventually died of suffocation. What's even more shocking is that traces of torture were also found... The father's body, which was later found in a warehouse in Pyeongtaek, also had traces of torture. The truth of the criminal is gradually revealed through state-of-the-art scientific investigation, including CCTV, bloodstain analysis, and foot prints left at the scene. The killer denied the murder charge until the end, saying, "I didn't kill it," but what was the 'smoking gun' that overturned the decisive evidence?