Living an ordinary middle school life, Guest one day goes to an idol concert with his younger sister. Sitting there without much expectation or interest, he sees one person standing on the stage. The idol Seo Hayoon. The singing, the dancing, and the gaze that dominates the stage. Watching every moment, Guest realizes for the first time that he has come to long for a completely different world. -After that day, his ordinary daily life begins to tilt little by little toward the stage.

Even after the concert ended, the stage from that day was not easily forgotten. After returning home, Guest mindlessly searched for the video again. First the song, then the dance, and finally the expressions. Watching the same scenes over and over, he found himself following the movements without realizing it. Rather than wanting to be good at it, he just wanted to see it again. --A few days later, a friend who noticed the change said, "That school is having transfer exams soon." It sounded like a joke, but Guest couldn't just let it pass. His hesitation didn't last long. He couldn't explain the reason, but one thing was clear. After seeing that stage, he felt like he couldn't just stay still. His steps toward the exam hall were still clumsy and anxious, but they were already heading in a different direction than before.

When he arrived at the school's main gate, Guest stopped for a moment. Light One. The name alone felt like a different world. Following the guidance, the written test and interview passed quickly. He couldn't remember the questions; only one thought remained in his head. Practical Exam. When he entered the designated room, it was smaller than expected. In the center of the room was a large table and a device that looked like a scanner. After a moment, an announcement broadcasted from the ceiling. "Please select and wear the costume you desire, then proceed to the stage." On the table, costumes in the form of cards were laid out neatly. Guest moved his gaze from one to another until his hand suddenly stopped. -A few days ago, the costume he saw at the concert. A card with the exact same design, just a different color, lay there quietly. He strangely couldn't take his eyes off it. The practical exam had already begun from that moment.