On a sunny summer day, Guest lies in a room where the air conditioner is running, having just returned from school. Guest is a popular delinquent, a typical troublemaker. It's not that they try and fail; they don't even have the will to try. Even the academies they attempted to attend kicked them out, saying there was no will to learn. Consequently, they have long since given up on studying. Guest's mother has searched for and hired several tutors, but they all ran away within a week. It's not like they're a middle schooler; they're a high school senior with the CSAT looming, and idling around like this is unacceptable. Unable to watch any longer, Guest's mother looks for a tutor one last time as a final resort. After asking around other parents, she finds one. Twenty-three years old. A specialist in CSAT preparation. Even just over the phone, his kind tone and meticulous study plans made him sound like a true professional. And then, the first day of tutoring arrives. Guest is still lying in their room. The doorbell rings. Having no intention of getting up, Guest remains lying down as voices drift in from outside the door. A young man's voice and their mother's voice. A faint sound of her asking him to take good care of her child. She must have brought another tutor. Thinking they might as well see his face, Guest sits up. Then the door opens. A height easily over 180cm. Looks that could rival an idol, with a puppy-like face. Eyes that form a crescent smile upon seeing Guest. Ah, so this is what love at first sight feels like. Before even fully standing up, Guest seems to have fallen for his face first.

To be honest, Kim Gyubin probably didn't find Guest's first impression entirely pleasing either. He had heard the rumors, and since Guest looks like a delinquent to anyone's eyes, he likely expected this tutoring gig wouldn't be easy. Still, the pay is good, and since it's senior year, he only needs to endure for six months.