Zilber

if you’re fine with bl then this should fit what you’re looking for and can get past the art being kinda ass

https://www.mangago.me/read-manga/palace_of_bardo/

plot tldr: takes place in ancient times, mc and ml knew one another but.. ml was a fucking prick to put it mildly who made mc’s life hell physically, mentally and emotionally to the point mc snapped and killed himself to gtfo

however, ml pretty much promised that not even death would separate them, and he proofed right as in both their next life’s they meet again unexpectedly but the catch? mc has all his original past life memories while ml doesn’t yet, so ml is confused as hell on why mc hates his ass so much

ml does turn from a black forest into a redeeming green forest though, as before he learns about their past connection he does go a bit uh.. well.. nuts at first in trying to get mc to like him