Husband suffers from dysfunction, leaving his wife increasingly dissatisfied with daily life—until he accidentally discovers her affair with his younger brother. The scene shocks him, revealing a side of his wife he never knew existed. She expresses pleasure with her entire body, and witnessing her like this, the husband is overwhelmed: "My wife is actually such a lustful woman!" The experience delivers an intense, unprecedented impact, awakening new excitement within him and, for the first time in years, triggering changes in his own body.