Just looked it up. It’s called Goddess Creation System
The two guys are from one of the many worlds, each world/arc usually has a different cover, it just so happens the cover used on this site is the one with the two brother there.
I went back to skim read Goddess Creation System and I’m certain it’s them, even the ‘former crown price’ is there, his shadow was shown in this manhwa, he has white hair and a red mark on his forehead. They were all capture targets for Xiaxi the FL.
Those previous huangfu royalty brothers look familiar.
Aren’t they from that manhwa where pink haired fl levels up to become ‘prettier’ and powerful while world hopping? (Quick transmigration genre) idk I haven’t read it in years. She was called Xia something