Available as both manhwa and novel.
My Slain Dragon Bride Me Case con la Dragona que Maté
Also known as: Me Case con la Dragona que Maté · Me Case con la Dragona que Maté Novela · Naega Jugin Dragon-gwa Gyeolhonhaetda · 내가 죽인 드래곤과 결혼했다 · I Married the Dragon I Killed · Naega Jugin Deuraegon-gwa Gyeolhonhaetda · Я обручился с драконом, которого убил · Me Casé Con El Dragón Que Maté
The pinnacle of magic was the 9th Circle, a realm said to be that of a demigod. The final key to reaching it was the heart of the Crimson Dragon, Valdrova. I never imagined my own fiancé would come to kill me. Yet for some reason, Valdrova offered up her heart without putting up any resistance. “…What is this feeling? Why does this leave such a bitter taste?” Then I faced it a despair far older and deeper than the hatred I had carried.