The mother, who had been widowed for many years, lived with her only son. The son was a mild-mannered and quiet person. One day, a serious murder case occurred in the city and her poor son became the top suspect for reasons unknown. The police had no evidence but jumped to conclusions and suspected the son of being a murderer. On the other hand, the son had no evidence to prove his innocence. Eager to close the case, the police saw no problem with their hasty investigation and soon arrested the son. The defense lawyer was both incompetent and unreliable, and it seemed that the son would be hard-pressed to escape conviction. With no other choice, the mother was forced to conduct her own investigation to prove her son's innocence. This movie marked Won Bin's comeback with a significant change in his acting style.