A popular and well-liked medical student in his small town, Goh Jeong-woo is intelligent and full of promise. His life, however, drastically changes following a night of a supposed to be celebration with classmates. Following his blackout, he is charged with the murders of two classmates. Even though he has denied any involvement in the events and has no recollection of them, he is found guilty and given a ten-year prison sentence based on circumstantial but damning evidence. After being released from prison, Jeong-woo has changed. He goes back to his hometown, but instead of the friendly reception he was used to, he encounters animosity, mistrust, and bitterness. The residents of the town continue to think he is a murderer, and they cause him hardship. His guilt and despair are exacerbated when his own mother, who had cautioned him against going back, has a terrible accident and goes into a coma. Determined to clear his name and haunted by his lost memories, Jeong-woo begins his own investigation into the killings. Detective Noh Sang-cheol joins him, and he is given a new case that appears to be related to the crime that occurred ten years ago. They develop a tense alliance despite their early mistrust of one another, each motivated by a desire to learn the truth. They discover a web of lies, secrets, and ulterior motives within the ostensibly peaceful village as they investigate the case further. They learn that the victims weren't as innocent as they first appeared to be and that there were a number of people in the town who wanted them dead. As a result of their investigation, they are forced to face influential community members who are anxious to conceal the truth.
