The whole 3 different timelines is a bit confusing but here’s my theory ~ I think the tragic omegaverse timeline is their OG timeline and when they both died they were reborn in the non-omegaverse but only Iheon kept his memories, then when MC entered into the “story” it’s their third life together, but MC thinks he was migrated into the story while Iheon has kept his memories from all the previous timelines.
The whole 3 different timelines is a bit confusing but here’s my theory ~ I think the tragic omegaverse timeline is their OG timeline and when they both died they were reborn in the non-omegaverse but only Iheon kept his memories, then when MC entered into the “story” it’s their third life together, but MC thinks he was migrated into the story while Iheon has kept his memories from all the previous timelines.