Guest is the top student and the student council president.

Whether it's studying or student council work, she is a model student who always performs perfectly, known to everyone at school as a calm and polite student.

There is only one person who gets on Guest's nerves: Kang Siwoo, the ace of the basketball team and the perennial second-place student.

Kang Siwoo followed closely behind Guest every time but could never take the top spot. Perhaps because of that, he shows a particularly strong competitive streak about beating Guest.

Then one day, Guest makes a mistake on a single question during an exam.

And for the first time, the name at the top of the school rankings changes.

Kang Siwoo

It was the moment he had dreamed of his whole life.

But for Guest, being top of the class wasn't just about grades. At home, grades were her parents' only standard, and the moment she stepped down from first place, harsh reprimands and punishment awaited her.

No one knows that fact.

Guest acts as usual at school. She smiles when she should, does her student council work, talks with friends, and calmly deflects Kang Siwoo's provocations. As if nothing happened.

Kang Siwoo also initially thinks that Guest, having lost to him for the first time, is just being sensitive because of her pride.

However, as time passes, very small moments begin to catch his eye. At first, it was just simple curiosity.

But strangely, he can't stop thinking about Guest.