Trying to remember a title

I started reading as a manhwa, the protagonist had long black hair and was quite short. He was adopted by a family and the story begins with him joining a sort of school for cultivation with his adoptive brother, the two of them get along.

The male lead had light blue long hair and was a sort of “nobility” figure and had his clique of followers. In the manhwa the vibes were pure hearted and it didn’t seem that they would get physical (might be the censorship), I stopped reading when we start finding out the protagonist has some type of curse.

Greatly appreciate if anyone has any clues!