I have a feeling maybe its like the Anime " Scool Life"
Where on of them is already dead, but thats the plot of the story and the other one has been talking to a Zombie the whole time.
Idk but something about their interaction is just weird and it seems like the Author keep dropping hints that one of them might be affected already.
Well,
So his chubby friend turn out to be a Alpha, but somehow he did not manifest until Collage, he turned out to be a Omega.
He was very Sad, but at that time they were already dating and living together so it was no big deal.
And if im not wrong they will be having kids
You can read at booktoki311.com and copy paste the Korean title, or try to click this if it works >> https://booktoki311.com/novel/6188540?stx=%ED%95%98%EC%9D%B4%ED%8E%84%EC%8A%A4&book=%EC%99%84%EA%B2%B0%EC%86%8C%EC%84%A4
If you want to continue from recent chapter, you can read from episode 4, you need to scroll down a bit to find the recent chapter though. Hopefully it could help! (⌒▽⌒)
What about the Main Couple, has the Author forgotten them
They are all main characters
That's what I'm disappointed about. :( it's like the author just decided to make our original main couple just a gag/ comedy effect now.