After Rebirth, the Demon Lord Became a Pillar of the Righteous Path

In the previous life, Fu Qingyin was jealous of evil and pressed hard on his disciple who made a mistake for the first time, causing him to turn into a demon. The two fought a decisive battle in Tianshan, and Fu Qingyin was defeated and imprisoned in the Demon Cave for a hundred years. I thought I would be relieved after death, but when I woke up, I found that I was back to where I started. The young man smiled brightly, as before. But he chickened out. Because of one wrong thought on his part, the whole world was destroyed. Fu Qingyin didn't dare to gamble anymore. He didn't expect that Ye Nanshu would avoid him like a snake or a scorpion when they met again. Fu Qingyin finally accepted Ye Nanshu as his disciple. He thinks that no one is born without making mistakes, as long as he doesn't force them. So... He became a pillar of righteousness. Selfish, despicable hypocrite attack x poisonous tongue It's probably a story where two people have a mouth and can turn misunderstandings into hatred.