Moon-jung is an unassuming woman who is killing time until the day her juvenile son, currently detained for an unknown crime, comes back home. She lives in a makeshift home inside a greenhouse but dreams of having a decent rented place in time for her son to return. To facilitate this, she works as a caregiver for an elderly couple, with the woman, who suffers from paranoid bouts, claiming Moon-jung wants to kill her and the elderly gentleman, who is going blind and losing his memory slowly to Alzheimer's, being a kind and friendly employer to Moon-jung. Prone to hitting herself in penance, she joins a support group for self-harming people, just because she cannot afford therapy, where she meets the clingy Soon-nam, who she unwillingly befriends. However, when a mishap occurs, her life soon begins to spiral well out of control.