I Just Reached the End of the Witch Story, but the System Retired.

Fu Han traveled through time, and the system promised to give him unlimited life and energy as long as he traveled through all the worlds and completed all tasks. Originally, Fu Han didn't want to go back. After all, after traveling through time, his talent was not simple, and his family background was not simple either. Until~~ In the first world, his gentle and virtuous wife finally transformed into a white snake, constantly licking and devouring her, and she shed tears like rain, causing him to drain out all his energy. In the second world, his well-behaved and charming wife finally transformed into the Nine-Tails, tightly entwined and sitting cross-legged for three days and three nights, until finally his Yang Qi was exhausted. … After much difficulty, Fu Han made it to the last world, but the system told him that it was retiring, and the reward was given to Fu Han in advance before leaving. But the trick is that if it does this, Fu Han will not be able to go back. Moreover, this is a world where the human race is trapped by demons and the witches from the past life still exist. Whether this time is the decline of morality or the rise of humanity depends on Fu Han himself~~ This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.