
I've read the novel, and yeas this is the gist of it!
1st story (main story): bad ending
2nsd story: happy ending - Aeroc remembers his past life and turns into an omega/ Kloff doesn't remember but is kinda affected by imprinting
3rd story: happy ending (?) - Aeroc doesn't remember / Kloff remembers his 1st life and suffers a lot because of the imprinting
Then there's an extra story "What if" continuing the main storyline

from what i saw he naturally becomes an omega in both the 2nd and 3rd story. esp when he's near kloff or i guess his pheromones
There' a theory that because he's kloff's pair from the main timeline so when he's near he naturally becomes or develops into an omega
OR
he was supposed to become one either way and the medicine from the first timeline just made it more faster but yea
soo many people are also confused as I am. so i tried going to the spoiler forum for the novel. and since i didnt read the novel directly, take it with a grain of salt
and hopefully novel readers here would help me explain or correct me hahaha
basically there is 1 main timeline (the first one)
and 2 alternate timelines
so that i dont see people complaining or getting confused with timelines. imagine it like this:
after they died in the main timeline (aka 1st storyline)
the souls of aeroc and kloff went in an alternate timeline
for the 1st Alternate timeline (the 2nd storyline, if confused) aeroc remembers the main timelime and kloff doesn't (only in his dreams) from what I've read imo this has the better ending than the rest of the stories (novel readers go at me cause i really didnt read it hahaha help)
for the 2nd Alternate timeline (3rd story)
kloff is now the one who remembers the main timeline and aeroc doesn't (i think they still end up together but for kloff it was bittersweet and not a super happy sweet ending but idk. novel readers hope you can expound on it more hahaha)
from what I've seen in the spoiler forum the imprint they did in the main timelime (1st story) affects them in both alternate timelines cause they're souls are connected i guess. so even if the other person doesnt remember, it's like they're mates of some sort
so you'd be seeing kloff getting hurt or affected when he gets rejected by aeroc
(i think it was already explained here in the story but in this omegaverse, alphas are the ones getting hurt physically or emotionally(?) when their mate rejects them)
and there's this theory that even without what happened in the main timeline (aka with the medicine) aeroc would still become an omega either way and the medicine just made it happen quicker (??)
but hey this last one is just a conspiracy theory