I Fell in Love With My Tomboy Friend's Avatar

My friend from elementary school was always athletic, with a tomboy look about her. She never showed any interest in being cute - in fact, she seemed to actively avoid anything even slightly feminine, like it was beneath her. That's just how she was, or at least that's what I'd thought for over ten years.

Original Novel:
Mofic, Naver Series, KakaoPage, MrBlue, Joara, Mootoon, KyoboBook