Four years into her marriage, housewife Yuna finds herself stuck in a stagnant relationship, wasting away her time and body. One night, her drunk husband invites his father over. Yuna joins them for drinks. The rare alcohol, combined with long-term sexual frustration, heats up her body, and she instinctively begins touching herself. Yuna masturbates wildly, like a frenzied female monkey, completely unaware that her father-in-law is secretly recording her.