Responses
Kotsu and gyeol didn't get married since they both like jeonghan so the three of them make some kind of promise when they're 20 y.o jeonghan gonna choose one of them to be his partner (jeonghan is an omega in this timeline even MC is confused at first since their second gender change from the OG novel xbxhbdjdnd)
And yeah, their father ended up together ٩(๑❛ᴗ❛๑)۶ and have one daughter (if my memory is correct and not mixing up with any other novels )
So like they (kotsu and gyeol) will fight over for jeonghan btw hahahaha kotsu and gyeol turned out to be both alpha at the end.
And in the OG novel (this is just my assumption) the main reason why gyeol become obsessive toward kotsu is because he looked like his dead father (our omega MC) that's why he become obsessed with him in the first place.... He basically has that in mind, where he must protect someone like kotsu (someone who look weak and need protection basic on his point of view), i guess his father's death (in the OG novel) left a trauma for him he see himself as someone who failed to protect his father.. and that's kinda sad tbh... ╥﹏╥