Hee-Soo is a musician known for many hits, but now she has a difficult period because of unprofitable ideas. Hee-Soo then met a boy in the elevator of an apartment building. Based on the reason for studying music, Hee-Soo gave the boy a "lesson about love". But time passed, the boy fell in love with her and Hee-Soo songs completed excellent. At this time, Joon-Ho, who taught her about love and music returns ....