Spoilers
During the last few chapters of the main couple's story, we find out that the time travel both the MC and ML did had an effect on the space time continuum, thus making it so worlds that would normally would not intersect start to collide with each other. When the ML tries to stop impending doom from happenning, there is a massive area in which space time continuum is affected. The second couple both got caught in this area, and they were briefly transported in an Omegaverse world. One of them became an Alpha and the other an Omega. Then pretty standard omegaverse ensues, omega goes into heat, that is relieved by the alpha, pregnancy etc. etc. Only thing different is that they don't believe in the omegaverse at first since their original world men cannot get pregnant.
As for the first couple, they become side characters, as the story shifts towards the second couple. So far they have followed the novel exactly, so i would dare to say that it will be like that up until the end.

I read this before but stop somewhere I can't remember where, but yeah, just scrolling to the latest chapter and I'm pretty lost... Can't someone tells me what's happening with the second couple, I don't think this story was an omegaverse to begin with, but what's happening with it?
Also does the main couple story ended? Don't spoil with what happened just tell me if it does or not. I'm gonna try to read this again...
Thanks in advance