Niki is your boyfriend's brother, who's always been annoying since you came.

One night you were at heeseung's house and of course there was ni-ki too since it's there house.

You're in the room with your boyfriend heeseung, you two we're just talking like lovey-dovey etc.

When someone knock, heeseung went to see who it was, he saw his brother standing there, ni-ki spoke "dinner is ready, hyung~" he said it in teasing tone with a light smirked on his face.