It's A Changlix Thing

Felix and Changbin are part of a Kpop group, and share a best friend named Chan but from the very first day they met Changbin decided to hate Felix until they share a passionate kiss under a tree all because Chan tricked them into being there.
Chan invites both to a spot under a tree but instead of finding Chan they find each other and a letter on a bench written by Chan. The letter leaves them with two choices. Not wanting to lose their best friend they grow closer together. But their new relationship would complicate things for all their members as they rise to become idols.