In Order to Save My Junior Sister, I Started Practicing Again and Became an Immortal Emperor.

He was originally the genius of the sect, but he lost all his cultivation on a thunderstorm night and started over again, just to save the junior sister he had grown up with. Everyone thought he was stupid, but they didn't know that every step he took to start over, he was getting a glimpse of the most terrifying truth in this world. . .