Yuna is living a happy married life with her husband when her father-in-law comes to ask for a place to stay. Her father-in-law and mother-in-law argue, refusing to give in to each other, so her father-in-law decides to move out. Yuna really does not want to live with her father-in-law, feeling very uncomfortable having another man around. Her husband also refuses to be intimate with her because his father is still there. She constantly reminds her husband to talk nicely to his father and urges both of them to reconcile quickly. Seeing the beautiful daughter-in-law doing housework makes her father-in-law, who has not been intimate for a long time, excited again. He repeatedly sexually harasses Yuna, taking advantage of her when she is asleep, he engages in perverted acts with her. Yuna resists continuously, but gradually the pleasure that her father-in-law brings to her is something she has never found in her husband. She slowly sinks into this wrong relationship, she loves her husband very much, but at the same time, she also loves the times she is intimate with her father-in-law! Yuna decides to keep this secret and continue to be intimate with her father-in-law every time her husband goes to work...