This is a youth idol drama about love and dreams written by music. Min Se-yi (Ha Yeon-soo), a transfer student who returned from New Zealand, unexpectedly met the Korean youth idol Yoon Seol-chan (Yong Hyung-jun) on the first day of school. Idol singer Yoon Seol-chan is very popular with girls, including many crazy fans. On this day, a scandal was caused by crazy female fans. In order to save his reputation, he had to return to high school. Yoon Seol-chan's arrival caused chaos in the school and also affected Se-yi, who was in the same class. On the other hand, model student Zheng Shanyu (Kang Ha-na) secretly liked Se-yi. He was also a cellist of the symphony club allforone. He was arranged to form a team with Se-yi and Seol-chan to evaluate music together. On the day of the performance, Se-yi and Shanyu played together, and Seol-chan came to play solo at the end. After hearing the song he sang, Se-yi ran away angrily. What kind of story will the idol singer, the guitar girl, and the cello boy write?