whats the title of this bl pleaseeee

It’s an ancient manhwa with a title similar to one popular manhwa, I think the story is about the son of a king or a high-ranking noble who somehow ends up becoming a grave cleaner and living in the mountains. A shaman tattoos his back, and I think it’s some kind of curse.... Then, the shaman sends him to one of the princes’' palaces. The prince turns into a monster at night but looks completely normal during the day. Whenever the prince transforms into a monster, the tattoo on the grave cleaner's back starts glowing, and his body gives off a pleasant scent that attracts the prince.