"When redemption becomes shared guilt, where is the boundary between light and shadow?"
Ji Yu, a graduate student in psychology at 211 University, was investigating a falling case on campus and got close to the only witness of the case - Song Cheng, a genius girl from the literature department. The two redeemed each other in truth and lies, but gradually discovered that each other had a darker connection with the case. When Ji Yu personally pushed Song Cheng to the police, she tore open her bloody scars: it turned out that they were all murderers.
Purpose: Focusing on Ji Yu's first encounter with Song Cheng, it shows how a top psychology student was involved in an elaborate psychological game. It also reveals the mysterious connection between the deceased Lin Miaomiao and Ji Yu's sister, laying the groundwork for the subsequent personality transplant experiment.