The hotheaded boy upstairs sees a beautiful but lonely woman living downstairs. Her husband, who works as a security guard, is never home, and when he does return, he uses her as a tool for releasing his sexual desires. The boy, while spying on her, silently falls in love with this despondent woman. A strange detail is that the woman never has face-to-face contact with her husband during their sexual encounters. This drives the boy, who accidentally obtains the key to the apartment downstairs, to finally give in to his urges and, imitating the husband's manner, he has a sexual relationship with the woman. When the secret is revealed, the woman is finally moved by the boy's naivety and sincerity, and a passionate love ignites between them...