
I think that so far he did not think too much about it (them having sex) and was more about "I like it, you like it, so we are good. No need to make a big fuss out of it... as it's nothing more than two people enjoying sex together). Now he got a tip from his brain about it but I assume he will not proactively act upon it and instead get triggered by jelaousy over Hyuk and his boss.
Hyuk is in the contrary more conscius of the situation itself but still in the process to understand what he really feels about his friend...
Just my humble opinion, I might be wrong. Looking forward to the next chapters!
OMG! Was Inseo the one who fell first?