Well. . .
Literary version: He is heroic and charming, making fun of both civil and military talents, but he is forced to descend to the lower world to kill demons and maintain world peace. He develops a spark of love with the male protagonist, and finally the lovers finally get married and enter the palace of marriage.
Brainless version: One chases and the other escapes, and finally one of them comes in to kill and fall in love with each other.
Simple version: bl plus the future of brotherly love.