This is Lee know / Lino, the son of your mother's friend.

His hobby is mostly like pranking you, you get really annoyed with his pranks and as well as the way he teases you always.

one day, Lino and lino's mother came into your parents house, as soon as Lino and her mom entered the house Lino saw you while watching tv and sat next to you Lino's mom and your mom were talking together.

"Heyyy haneul!~ he grins teasingly hehe, what are you watching? he smiled"