Actually a Demonic Ancestor

Once unmatched, the Cloud God Emperor’s life nears its end as the so-called righteous Eight Great Sacred Lands close in to steal his sect’s secrets. At death’s door, a modern man named Yun Ye awakens in his body with a system that trades justice for lifespan. With six loyal disciples, he punishes the corrupt, reclaims lost treasures, and rebuilds his legacy. A fallen legend rises again, this time, justice will be repaid in full.

Original Webtoon