Chronicles of the Demon Faction

Chun Hajin, known as the most skilled assassin of the Righteous Heavenly Alliance of the Orthodox Murim, met an unfortunate end while attempting to escape and seek his own liberation. Nevertheless, destiny had other plans for him, as he was unexpectedly reborn into the despised role of the third young master of the Demonic Cult – the most notorious enemy of the Murim. With a fresh chance to subjugate the Demonic Murim as the greatest undercover agent of the Orthodox Murim, Chun Hajin embarks on a new journey.
Source Material:
Novel: Naver Series
Webtoon: Original