我与黑帮大佬的365A young girl stays with her estranged grandparents in the city while she waits for the results of her audition for an international performance group. Her grandparents welcome her, delighted about the chance to get to know their granddaughter better. While staying at the house, the girl gets to know her uncle, who suffers from a mysterious long-term lung illness and is mainly confined to bed. She also observes her grandmother's weird religious rituals, some involving a swimming pool in the basement. When the girl's father finds out that she is staying with his parents, he persuades his sister to visit the house to get her out, ending with a terrible tragedy.