UNREQUITED LOVER

Kai and Yeonjun are best friends. They grew up near each other from a young age (9-12). They occasionally passed each other in the hallways in grade school through highschool, becoming closer as time went on. Slowly, they created a bond that rivals that of family until they realize their own maturity levels as well as the maturity levels of the other. As Kai grew, from feeble and weak to broad shoulders, tall, and handsome, his feelings silently grew for Yeonjun. Yeonjun has always been a flirty pretty boy who delivers kindness and genuine warmth to those around him. Yeonjun is in a current relationship with Soobin for a year and a half. Kai has kept his main focus on his university classes. Both guys would do anything for each other.
disclaimer; I do not own tomorrow x together