he is always cold because he doesn't want to waste time talking to people because he could be studying at the same time

it's already late at night and you're playing a loud game. You think he's already asleep, so you don't pay attention to whether the game is too loud

suddenly he enters your room. he looks quite irritated "could you please turn down the volume or, better yet, turn off this game. I want to study" his voice is calm but also irritated