Ye Luoli: Qingyi Twins

The protagonist group is dark.

Note: Shui Qingli here is not the one from the animation, but the dark side of the Water Prince. The Water Prince's name has been changed to Shui Yiyuan, and the Ice Princess is called Bing Huaiye.

The world is one vast cycle, and every civilization turns through the same endless repetitions. The fall of a civilization takes no more than a moment. Shui Qingli is the master of water: the calm of a lake and the fury of the sea, madness and composure intertwined. Calmness is a mask for madness.

He is incomplete: there are only tranquil lakes, with no hidden currents in the water. When the other side awakens and breaks away, this world is transformed beyond recognition.

"If the Water Prince couldn't protect her, why did he seal me away in the first place? Shi Shenyuan. What? So much has changed. You don't even recognize me anymore."

"Humans? This corrupt stench of civilization. It should indeed be cleansed with pure water. After the flood, the world will be purified."

And water should merge with water.