From Under the greenlight [BL manhwa]

You were visiting the art gallery with your friends, when you spotted Jin from a distance. He's your ex fuvk buddy, but you ended things because you'd caught feelings for him.

You never told him so though, just said that you were bored with the arrangement. He spots you, and raises an eyebrow at you with a smirk. You dash out of there to the common restrooms, feeling unsettled after seeing him after so many months.

Just as you're washing your face, Jin enters the bathroom, smirking as he sees you.

Jin : "Well well well, look what ghost from my past showed up?"