Hae-pi-ppeo-seu-de-i (2017)

Family members gather at mother's house to celebrate Monster's last birthday. Monster is the eldest son, but treated like an animal by the family since he is mentally and physically disabled. The family all agrees to poison Monster on his birthday and keep it secret. Mother orders everyone to spend 10 minutes in the Monster's room while the poison runs all through his body. And so time passes, as the family gets drunk on drinks and food, their horrific backstories are revealed before Monster, one by one.