[it's not entirely unsurprising to him; he almost expects that heung soo will look at bit like this. he's seen those sleepless nights before, though they were usually because of the excitement of a big soccer match rather than the heavy weight of being the only survivors (if it could be called that) from their world. not that it matters; all that's really important here is that his friend is struggling.

when heung soo turns away from the door, nam soon will follow in as he always does, hands still shoved in his pockets. he'll nudge the door close with the same thought in mind — he doesn't really doubt that before they sleep, topics will come up that don't need to be shared with just any passer-by.]

Aigoo... [he says with a sigh, but it's more to retain that more comfortable tone between them to ease the strange tension than anything else. which may or may not include reversing an old joke of theirs.] Tell hyungie what's keeping you up at night before you toss and turn so much that you fall off the bed later.

[or course, despite the teasing words, there is an underlying sense of seriousness. even if nam soon has a pretty damn good idea of the root cause, it's easier to just drag it out in the open so they can move past it and get some sleep.]