The Genius Swordsman of Mount Hua

Phantom Swordsman Dokgo Heon, an unrivaled master of the Unorthodox Faction, and Hyun Jo, the master of the Mount Hua Sect, forged a friendship through crossing blades. However, the Demonic Cult launched a sudden attack, tragically ending the life of Hyun Jo. At the brink of death, Dokgo Heon possesses the body of Hyun Jo's disciple, Mu Hwi... and thus began Mu Hwi's struggle in fulfilling his friend's dying wish—to save the Mount Hua Sect.

(Source: Naver, translated)