Mo Xuanya, the son of the Demon King, was raised by green beasts since childhood and lived by the weak water river. He unexpectedly met the weak water elf A Yuan. This is a world that belongs to the two of them. However, fate is unpredictable. The King of Evil Delights seduced the demons in the demon world to attack the sky in order to occupy the heaven. Instead, he was ambushed by the heavenly warriors. Some of the demon generals fled to Weishui, disturbing Mo Xuanya's peaceful life. A Yuan sacrificed himself to save Mo Xuanya and suffered the curse of weak water, but Mo Xuanya drank Meng Po soup and when he woke up, he was taken away from weak water by the green beast, and he also forgot about A Yuan. Where will fate push Mo Xuanya, black mandala...