Cheonhwa Archive's Young Master

The soul of the charming and imposing Murim Alliance Leader, Hu Gong, suddenly possesses the body of a young man one day. That young man's name is Beom Hang. He's the young master of the "Heavenly Grand Archive," one of the three major archives of the Jianghu, yet a sorry excuse of a person. In order to determine why his soul has swapped bodies, Hu Gong begins to train Beom Hang's body. When the possessed young master of the Heavenly Grand Archive's movements are totally different from how they used to be, it starts to attract the attention of the Jianghu...

(Source: Naver Corporation, translated)