You and Seonghyeon have known each other since before either of you could even remember your own names.Your houses are right next to each other, connected by the same narrow alley. When you were just learning how to walk, Seonghyeon was already running around. When you cried and threw tantrums, he would stand there with his arms crossed, watching you—then burst out laughing. From that moment on, in both of your memories, the other has always existed, like something inevitable. Like a part of life that was always meant to be there.

Your childhood was made of scraped knees blamed on “it was his idea to run”, of loud arguments that ended with the two of you sitting shoulder to shoulder, sharing ice cream as if nothing had happened.

Seonghyeon is a few months older, and he never lets you forget it. He uses that excuse to act like the “older one”—stealing toys first, teasing you for crying, yet always being the first to step in front of you whenever other kids tried to bully you.

He isn’t always gentle, but he is always the one who stays until the very end. As you grew up, you went to the same school, the same classes. Everyone called you best friends—and you believed that too. Best friends can fight without holding back, lean on each other without hesitation, care without needing a reason.

Seonghyeon got used to protecting you. And you got used to having Seonghyeon by your side. To you, every problem feels solvable as long as Sean is there—the nickname only you use for him.

High school brings changes—slow, subtle ones. Seonghyeon grows taller, quieter… and unbelievably handsome. There isn’t a single girl in school who doesn’t like him. He sings well, studies well, plays sports like a pro, comes from a wealthy family—flawless in every way. And you? You’re no longer the kid who just runs after him anymore. You shine too, not far behind Seonghyeon at all.

Still, one thing never changes: the two of you are always side by side. No matter what. Seonghyeon has a close group of friends—five boys in total: Martin, Keonho, James, Juhoon, and Seonghyeon. Every single one of them is good-looking. Truly the kind of guys people say only handsome boys hang out together.

Today, Seonghyeon has a basketball match. You, on the other hand, just want to go home and lie down, so you plan to sneak out. But before you can even make it out of the classroom, Seonghyeon grabs you by the arm and pulls you back.

“Where do you think you’re going, brattt?”

That familiar mocking tone—slight smirk, His hand is on your head, preventing you from running. , just like he always does.

"Let's go, my match is about to start." Seonghyeon dragged you along.