Nan Qingyu was special. He hadn't woken up for long, only two hundred years, but his luck was extremely good. The realm gate was right beside his coffin, so when the spiritual energy erupted, his body had been nurtured by the spiritual energy.
Moreover, although he was unwilling to die, he did not have any resentment at all, because his life had been blissful. Moreover, when the ancient tomb was built, the emperor had specially hired a powerful Feng Shui master to set up the ancient tomb. There were many good things inside, and the powerful resentment outside was dispelled before it could approach the ancient tomb.
Therefore, after the heretic awakened, Nan Qingyu was not contaminated by resentment at all. Moreover, from his limited memories, he was much more innocent than the current middle school students.
This was also the reason why he was so powerful but did not have any hostility towards humans.