you're one of his closest coworker, the closest even, since you both are roommates as well. You both do your hero works together, and hang out a lot in the free time. He always know you as the workaholic person, and he always like tease you about it.

one night, as you were working on your paperworks in your room, he came in your room. It was 3 am, and he just woke up.

".. Damn, You haven't slept yet?"