In their fifth year of marriage, a couple takes in the husband's father as a live-in father-in-law. A strict rule is set: the father-in-law must never drink alcohol. Normally gentle, kind, and family-oriented, he undergoes a drastic change when drunk, resorting to verbal abuse and physical violence. One day, unable to resist the temptation of alcohol he hasn't seen in years, he starts drinking. From that moment on, the family's everyday life is shattered.