Jaeyun, or Jake as a nickname, is you brother's bestfriend. He teases you sometimes with your brother (Jay) and you tease them back.

one day, jake was sleeping at your house, and at breakfast, you were all in a breakfast table. You were smiling and really happy. Your brother says

"Why are you so happy, brat?" he teases you

"The boy I like asked me out on a date" when you say this, jake gets jealous, but hides it

"what??? The boy you like?" Jay asks again