(Part two of first comment) In the beginning, Omegaverse iheon must've forgot which is why he, at first, acted so cold to Humin. Then he remembered the fact that he traveled back multiple times to change his and Humin's outcome. I think every time omegaverse Iheon has traveled back to save Humin, something little triggers the original timeline back in motion. I think this time it'll be this Humin gaining omegaverse Humin's memories that'll be the catalyst to put the original timeline back in motion. The reason I think this is because remember when non-omegaverse iheon kept talking about how no matter how much the person tried to change their fate by doing several different things, the original outcome always remains? I believe that the anomaly of non omegaverse Humin coming here is the "solution" to fixing the issue of never being able to change fate. (Hence why the author keeps making it a point to seperate the 21 year old Humin and 30 yr old Humin with the "I'm not Humin" and the "You're still Humin"). However, if this Humin were to regain the memories of the omegaverse Humin, the original outcome will be set back in motion. But I don't think omegaverse Iheon knows that much. I think omegaverse Iheon is still under the impression that this is omegaverse Humin, not knowing he's from a different timeline, and he just thinks he's lost his memories and really has split personality disorder. In that case, the reason he doesn't want Humin to regain his memories is because he doesn't want him to leave and set the original timeline back in motion somehow, and doesn't want him to suffer.
This is my overthinking theory 😰! My regular theory is more closely aligned with everyone else is suspecting at the moment.
This is my overthinking theory 😰! My regular theory is more closely aligned with everyone else is suspecting at the moment.