A new type of deadly virus spread throughout the city, and the apartment where has different social classes of people is sealed off. With the fear of the virus, and the conflicts of the different classes, the residents have to spend and survive in the new habitation.

Yoo-Seul is a student of an art high school. She is a talented pianist and who won various contests, but she is driven by her mother. Yoo-Seul's mother wanted to become a pianist when she was younger. One day, Yoo-Seul has an accident. Yoo-Seul may never play the again because of the accident. With the help of her friend Cha-Sik and Yoo-Seul's rival Jin-Mok, Yoo-Seul begins to live a new life.