Jang has just broken up with another girlfriend. His mother wants him to focus on school instead of dating, but his father tells him instead to wait for "the one" -- he'll know who that is when his heart beats so loudly he can hear it. When a pair of siblings and their father begin renting the apartment, Jang meets the sister, Ice, and feels his heart beat for her. But after playing some basketball with the brother, Earth, his heart beats as well. Could his heart beat for two people at the same time?
