[Comprehensive Fantasy] The main characters are all my younger brothers

In a word: No matter how powerful the protagonists in fantasy novels are, they are not as powerful as my protagonists.It is roughly about a powerful and beautiful young man who travels to the world of fantasy novels and participates in the life of the protagonist.Definitely some worlds: Douluo Doubo Tianzhu becomes peerless full-time, other undecided protagonists have no counterattack