BTS as your loving (or not) brothers when they see you studying till midnight.
You knew it is him the moment he turns the door knob. (He does it very loudly)
He patted your head when he saw you studying.
You told him to get out.
He caught you using your phone.
He laughed at your math workings and boasted about his excellent math scores.
He helped you with your work.
He gave you a hug to spur you on.
He stayed by you because he wanted to make you feel that you are not alone.
He made you treats.
He distracted you by asking you to rate his selfie.
He didn't even bother walking into your room.