A student becomes a recluse in response to her best friend's suicide and locks herself in her room. She believes that someone is in the room with her. Her alarmed family hires a psychologist to intervene.

An old bachelor Seok-joong, who has no experience in dating, falls in love at first sight with a prostitute named Eun-ha. At first Eun-ha shows no interest in Seok-joong, but gradually she begins to be flattered by his devotion and eventually falls in love with him. They marry. However, one day, Eun-ha finds out that she is infected with HIV and decides to leave Seok-joong.