The saint craftsman Qitian Zhuge recruited the five "Five Saints" in order to deal with the devil, but his second disciple You Lanfeng was actually the biggest devil. In fact, Qitian Zhuge knew that You Lanfeng was the Demon King from the beginning, and he knew the outcome of the story from the beginning.
But without You Lanfeng, the first generation of Demon King would not be able to be killed, so Qitian Zhuge made a bet...