not a manga(?) i mistaken it for the manga "gokurakugai" cuz of the cover due to both comics having a red hair chrcter in it. The cover is i think the mc (the red hair) i found the manhwa(or manhua) from the "featured manga" section
https://www.mangago.zone/tag/red%20hair/ You can check this tag maybe
it included some supernatural shii like ghosts and the seme having some kind of power (or aura idk) that makes the ghosts afraid of him(nott sure if hes a grim reaper) the uke was getting chased by ghosts or those cweepy things coming outa the ground, idk the cause of that tho. thenn im pretty sure the seme approached the uke and made some contract w him so that he wont get chased by them ghosts. &&& i think thats how their relationship started (●'◡'●)ノ
Yall is the mc/uke a child? Can someone confirm he's not? ╥﹏╥
For even more reference, You can check out this authors another work , " Touching your night " ... The uke from there and this Ignat story have similar build and height . In touching your night the uke is an grown adult .The height difference between Uke and seme in that story is not too large . But in bride of Ignat , the seme is really tall cuz he is not a human . I would say that human height of his is still small for a dragon as dragon are about 115 ft tall.
i forgot what happened to the mc's brother (too lazy to go reread chapters), did he die?