Bong Hee's childhood friend-turned-idol, Pa Ran, returns and attends her high school, causing a stir in the entire school. Although she is secretly his biggest fan, Bong Hee feigns disinterest and maintains her die-hard devotion to a rival boy group. Pa Ran shows interest in her and tries his best to enjoy normal school life despite his reputation as an idol, but when a dating rumor and overseas engagements for his group challenge that, what will become of their relationship?