Mingyu as your older brother's best friend, who you've been admiring for years. You kept your feelings hidden, because you don't want to ruin your relationship with him.

One day, Mingyu went to your brother's house, where you live in. You're in your room, studying math as you don't get the formula.

Mingyu went upstairs, towards your room and suddenly appears behind you as he ruffles your hair, teasingly.