@Your_Dino_Overlord it is more likely that Rose is the prince since he said that he's related to the royal family in chapter 7 (I think?). Also, it was mentioned that the crown prince's face has yet to be revealed and Rose complained about how long his father was going to lock him up.
But...
I like the story so far and I hope the MC will keep doing solo dungeon raids since a lot of the "going against the hero" trope mangas/ manhwas are dropping the "lone wolf" trope very quickly.
And you shouldn't compare every single work that uses the concept of dungeons and monsters suddenly...