Yes, it's both of theirs 2nd life but only seme remembers. If they formally bomd uke will remember everything that's why seme is trying to make up for the past life without bonding (if they bond, they will share ALL memories which he doesn't want) but uke is getting flashbacks since they are becoming emotional close.
do this have a novel to it?
I think so... On NU probably, but idk how much it is translated. It's not exactly my scene, so I just checked the synopsis and spoilers... because I'm impatient like that
DID HE TREAT HIM BAD IN THE OTHER LIFW BRO anyways i love this feelings feel to real and i love the plot and how its very well written