Na Ae Joon dreams of his idol Choi Si Yeol acting sweet and romantic toward him, only to wake up flustered and embarrassed. By day, Ae Joon is a hardworking high school Korean teacher; by night, he is a devoted fan of A-One’s Choi Si Yeol. But when a variety show filming unexpectedly brings Si Yeol to his school, he shocks everyone by personally choosing Ae Joon as his partner.

On the first day of filming at school, Choi Si Yeol openly shows his affection, boldly declaring that the teacher is his ideal type, leaving Na Ae Joon flustered. As they film the campus tour, sparks of romance begin to fly, while Ae Joon grows increasingly anxious that his secret life as a devoted fan might be exposed…

After exchanging contact information with Si Yeol, Ae Joon struggles with inner conflict, unsure how to take a step closer to his idol. Meanwhile, Si Yeol teaches in the classroom as a trainee teacher, showing a professional charm different from his stage persona – drawing Ae Joon even deeper into his feelings for him.

Si Yeol confesses that he has liked Ae Joon from the first time they met and asks to keep in touch. He then invites Ae Joon to dinner, showing his thoughtful side from ordering to paying the bill, before making an even more intimate request.

AeJun wakes up at SiYeol's house, troubled by the fact that he cannot remember last night. Meanwhile, SiYeol, who had approached AeJun with a plan in mind, is surprised to find himself genuinely drawn to him...

As time passes, SiYeol's feelings for AeJun grow deeper. He is confused, unable to tell whether his desire to confess is genuine or part of a scheme.

Former member Ju-ha’s unexpected appearance interrupts the intimate moment between Si Yeol and Ae Joon. He reveals that he once lived with Si Yeol, leaving Ae Joon with mixed emotions. Yet as the weekend passes, the two share a lover-like atmosphere, and Ae Joon gradually grows used to Si Yeol’s presence – even preparing to confess the truth about being his longtime fan.

During a radio program, Si Yeol reveals the truth behind the past accident and defends Ju-ha. Meanwhile, Ae Joon, torn by his emotions, decides to quit the show under the pretext of overwhelming pressure. Shocked by Ae Joon’s decision, Si Yeol resolves to drop all pretenses and confess his true feelings to him.

Ae Joon firmly rejects Si Yeol’s feelings, leaving both of them heartbroken. A month later, during a radio program, Si Yeol uses a listener’s story to indirectly reveal his emotions for Ae Joon, and continues reaching out through messages and video calls, desperately trying to regain Ae Joon’s trust.

Looking back on their first meeting, their first kiss, and the night they spent together, Si Yeol realizes he has hopelessly fallen in love with Ae Joon. As filming resumes, he shines with his idol charm while showing Ae Joon a deeper affection than ever before.