Hello I forgot this manhwa where the bottom is a buff one they're kind of a demon then the top is something can heal the bottom... the demon king maybe?? (Bottom) have this dragon pet?? They have long hair, the top one got yellow golden hair i think so
Do you mean this one? https://www.mangago.me/read-manga/moon_of_the_devil_world/
First ongoing story I'd witnessed till the end ლ(´ڡ`ლ)