This flashback is their first life in which seme treated the uke horribly and I think because of that uke killed himself using the gun in seme's study. I believe seme regretted everything he did after uke killed himself.
The beginning of this story is their second attempt at life where seme is trying to make things right and treat the uke well. Though I'm not sure how seme got reincarnated but only he remembered their first life and the uke didi not.
Now finally uke is gaining his old memories back and we are reading those flashbacks.
So it's kinda paranormal
Kinda! It involves alternate universes, their “souls” I guess were sent to an alternate timeline after what happened in their first life, the ML remembers their past life and the MC doesn’t yet
So this is a flash back right why did they get married and why is he so cold? What is the main plot I've been reading it all but still am a bit confused and why did they get back together in the future part of the story