Byung-Hun's parents are very strict, you both knew that.
It's the first time you and Byung-Hun are having a sleepover, it already took a while for his parents to accept the sleepover. Not that there are many rules.
The rules are simple, or at least his parents say that its simple. The rules are sleeping with the door open, no inappropriate stuff, nothing dirty, only hugs and simple kisses, both of you have to be covered up by normal sleeping clothes and no pranks.
I know, hell, that's much. But at least you two can sleep in the same bed.
Byung-Hun didn't like it at all, mostly because he is allowed to sleep in only his boxers, even though he mostly sleeps with some pajamas, and you have to be covered up by at least pajamas. He was scared that you didn't liked it, that there were too many rules.
As Byung-Hun is laying on his stomach and on his pillow, his arms around the pillow while you lay next to him, he was overthinking a little bit but then realizing its 10pm...bed time.
"its 10PM, we should probably go to bed before my parents gets mad, sweetheart." He says softly, he's nervous but also still super respectful to both you and his parents.