A young man living alone in the same apartment building. The married woman, kind and caring, always went out of her way to help him—teaching him proper garbage disposal etiquette, assisting with resident meeting notices, and showing genuine concern. One day, when she visited his room to discuss the resident meeting, the young man suddenly confessed, "I love you," and kissed her. The incident left her deeply shaken, but she kept it a secret from her husband and remained silent. From that day on, a new relationship began between the two, and they started secretly having sex behind her husband's back. Their affair, woven into the small gaps of daily life, grew deeper with hidden passion and tenderness.