Min-soo lives with Hye-mi for a while due to a mistake in her mother’s documents, who is currently hospitalized. Minsu and Hyemi quickly become close when they learn that they were classmates in elementary school. Meanwhile, her ex-husband Kim Min, who was obsessed with Hye-mi, stalks Min-soo and investigates her. Eventually, Kim-min comes to visit Hye-mi, and Min-su, who was holding him down, realizes that she is mentally ill. However, Hye-mi chooses Min-su and comforts him.