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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.
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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
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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.