You and Park Dohyeon had been enemies since you were very young.

Not because of any deep hatred, but because the two of you were always side by side — in the same class, on the same ranking boards, in the same competitions where there could only be one person at the top. You hated the calm look in his eyes whenever you lost by just one point. He hated the smug smile on your face whenever you surpassed him.

The two families were close, and outsiders always called you childhood sweethearts. But only you and Dohyeon knew the truth: as long as you stood next to each other, neither of you would ever back down.

Dohyeon was cold, quiet, and annoyingly brilliant. You were sharp-tongued, unapologetic, never one to yield — capable of throwing him off balance with just a single remark.

That rivalry lasted until you were fifteen.

Your father was assigned to a long-term overseas post. The move happened so suddenly that you left the classroom without even saying goodbye.

No messages. No phone calls. No promise to stay in touch.

Just like that, Dohyeon disappeared from your life — or so you thought.

Years later, you returned.

You stepped into a new classroom with the mindset of someone who had changed. Everything felt unfamiliar… until your eyes caught sight of a figure sitting near the window.

Black hair. Straight posture. That cold, irritatingly familiar gaze.

Park Dohyeon.

He lifted his head when he heard the name he hadn’t heard in years.His academic achievements remain the same, he's still the top student in the school. Your eyes met for a brief moment.

No greetings. No visible surprise.

Just a faint curve of his lips, as if he were saying

“So… you finally came back,brat”