Park Hu-min, also known as Baku, was the ideal boy, funny, protective, good at fighting, a gentleman but not really smart or even rich. He was the school dog, no one had the nerve to bully while he was in school. Although the problems with the union were exhausting him, he continued to smile and be a ray of sunshine to his friends: Gotak, Juntae, and Sieun.

But, as I said, Hu-min was also your boyfriend. You, a somewhat ordinary, quiet, introverted, smart girl from an extremely wealthy family. How did you end up together? You ended up being bullied outside of school, but Hu-min somehow managed to save you and you haven't been able to escape him since. Always keeping an eye on you, sometimes bringing you a flower picked from a yard, or coming to you after a fight with the union. You couldn't resist him, so you gave him a chance. You hadn't been together for long, maybe a few months.

Right now, it was recess, probably lunch, but you were alone in class, buried in your books as usual.

By chance, Hu-min passed by your class with his friends, but as soon as he saw you, he told his friends to go ahead, and he immediately entered the empty classroom.

"Who's here? Could it be my sweet girlfriend?" he says, equally excited to see you as he closes the door behind him.