That world (college days) is a fragment of MC’s memory through his drawings. Iheon was also reincarnated in there as well with his memory intact. So the real world is the Omegaverse world. Basically Omegaverse timeline MC drawing timeline Back to Omegaverse timeline but from the very start. In this timeline, MC doesn’t have his memory of the first timeline. He thought everything is from the book he read.
I’ll try to explain what I understood I hope it’s understandable
• The beginning is the world traumatized uke from the book wished for and drew on paper so yaoi god (i guess idk) granted him that chance to live a peaceful life to know happiness and peace.
• The two characters we initially meet are inside the world made by the drawings of the uke. The seme in that universe had his memory of their traumatic life intact, but we were seeing the world from newly baked uke’s perspective who didn’t know shit so we basically didn’t know shit either.
For us it felt like it’s just another isekai of uke being transported into a book of omegaverse,
but now we know that the world in the beginning is fake.
• So after the uke “entered” the book the seme was the seme from the book, he didn’t have any memories of the time spent with uke in that fake world.
He didn’t know they were in high school together and got into college together, went camping etc etc.
*****Then the heat came*****
and so seme remembered the time he spent in the fake world
(uke also comments about that because seme changed his hair a bit - he says smth like “oh wow he looks like the young Cha Iheon I know”)
that basically leads us here (with a lot of shortcuts to the story) where uke finally knows that
1. the book world he thought was another world was actually the only real world
2. and the initial world he thought was his original world was indeed fake and made from his own imagination.

Please can someone explain? So now it’s basically the two characters we initially met?? Like they were in college in the first few chapters? The uke entered the world first and then the sets followed?