Namjoon:
You've seen Namjoon very often, because he and your brother are working on a school project.
You want to help them but your brother says no because Namjon can be "dangerous".
And than Namjoon:
You are sitting on the couch when Namjoon arrived embarrassed and asks you to go to the prom with him, ignoring the curses from your brother.
You accept and that same evening you go out whit him and it's perfect, you have fun and dance too much.
He takes you home, without thinking of it, you kiss Namjoon cheek and saying goodbye.