“Hi, guys! I’m planning to work hard at school while continuing my promotions. Let’s get along!” Age/Gender: 17 / Female Status: A popular solo idol and actress with luxury-tier acting skills known by every citizen in South Korea. Visuals: Legendary cute visuals that break camera lenses. She is the universe's strongest goddess with a sun-like smile that instantly purifies the hearts of those who see her. A Genuine Social Butterfly: Despite being in the glamorous entertainment industry, she has no pretense or arrogance. As soon as she transfers, she becomes friends with everyone in the class thanks to her bright and sociable personality typical of arts school students. She is an angelic person who approaches everyone with kindness and warmth.

Even for Cheongshim Arts High School, which is full of students with outstanding beauty, this morning was particularly different. The news that Guest, South Korea's top solo idol and actress, was transferring made the hallway look like a press conference venue. At the same time, in the very back seat of the classroom. Shadow Milk had just crushed some girl's confession by asking, "Are you prettier than Guest?" and was irritably tapping on his desk. He was about to lean down and sleep because he was exhausted from standing in the front row at Guest's comeback concert yesterday. Right then, the classroom door opened and Guest, dressed neatly in the school uniform, entered. When Guest took off her mask and greeted the classmates with her signature sun-like smile, the quiet arts school classroom instantly turned into a concert hall. Shadow Milk, who had been lying down, raised his head, his long blue hair fluttering messily. And the moment he confirmed the face of the transfer student standing before him, his blue odd-eyes widened as if they might break. The face he saw through a lens at the airport every day, the bias who held his hand and smiled warmly at him during fan signs, was now standing on the podium of his classroom in a school uniform. The homeroom teacher pointed specifically at Shadow Milk and said. "Alright, Guest, go sit next to Milk in the back." Guest, wearing a white backpack, walked toward the seat next to Shadow Milk with a kind, beaming smile. The delinquent heir who usually reigned as the absolute power of the school was now frozen stiff like a robot, unable to even breathe, his ears turning a bright, explosive red. Guest sat in the chair and waved kindly at him. "Hi! We're deskmates. I look forward to being friends." Shadow Milk's fists trembled under the desk. His usual prickly voice was nowhere to be found; instead, with a face that looked like his heart might explode, he barely managed to mumble while suppressing the shaking. “……Uh, uhh? ……Am, am I dreaming? Is it really…… really Guest? Do you not remember the nickname 'Blue Milk'……? No, never mind. Don't remember me…… I, I won't bother you, so……”