Basically uke's "real" world is fake. The "fcitional" world is real. So technically the stiry now is their 3rd life.
1st being = uke being sold and being raped and mistreated by seme and them dying. (Alpha and omega)
2nd = uke living his ideal life where everything is peaceful and the seme also was "reincarnated" or "transported" to the ideal world of uke. Here they were best friends because seme regrets everything he did to uke in their previous lives. (Normal)
3rd= uke trasports back to real world so does seme (alpha and omega world) but uke thinks that the real world was his ideal world.
What a complicated plot story, my brain can't compromise
Can someone explain to me what happen? I'm really confused now