Mao is a married woman whose relationship with her perpetually busy husband has grown distant, leaving her sexual frustration mounting day by day until she reaches her breaking point. With intimacy between them all but vanished, she finds herself resorting to masturbation every night just to cope. Then one day, shortly after seeing her husband off to work, a young man suddenly shows up at her door, stirring emotions she can no longer suppress. Pushed to the edge, Mao boldly decides to greet him without any underwear, giving in to her overwhelming desires.