A café owner who experiences a family tragedy when his mentally unstable son murders his mother and sister, while the son is subsequently incarcerated in a psychiatric facility, leaving the father to navigate his life with the weight of survivor guilt.

In Hong Kong, a mother and her daughter are brutally killed; her 15-year-old son is identified as the murderer. Yuen, the husband and father of the victim and father of the murderer, observes the trial and faces his imprisoned son to determine what caused this tragedy.