World Development System - Chapter 295

[ABO/ Omegaverse - Mature Content]Once a single nation, now the Kingdoms of the Zui wolves and Xin foxes have been enemies for ages, with the humans from Su just trying to survive the fallout.Chu Yun is a pampered nine-tailed fox who lives a life of leisure and contentment, until one day his uncle, the king of Xin, calls him over to announce that a marriage agreement has been signed between Zui and Xin.Xiao Zai might be a prince, but despite his noble birth his position is anything but stable. He and his omega father have struggled to survive the royal harem's cruel games and the king's displeasure.One day, the king informs him that he'll be marrying Chu Yun as part of the treaty between Zui and Xin.It would have been an ideal situation, if it weren't for the fact that both Chu Yun and Xiao Zai were alphas.---Chu Yun: we're in this mess now, let's try to make the best of itXiao Zai: ok, how?Chu Yun: ....Xiao Zai: if you come any closer I'll rip your throat outChu Yun: okay, let's see who has the bigger....teeth.---Spoiled, cunning proud alpha fox MC x smart, determined, belligerent alpha wolf ML

The formless ancient world was infested with despicable demons. They hunted and feasted on mankind, keeping the human civilization constantly in a weak and suppressed state.

During the first known year, a magical mountain descended into the world from the realm of the Gods. Carved on this enormous mountain was a message: ‘Heaven Prevails’…

After the Grand Descent, a name that was given to the descending of the mountain, the Three Great Sages made their ways to Mystic Mountain where they learned to harvest what we now call magic, establishing the Mystic Cults and eighty-one sacred shrines to help aid mankind with the cult’s mystic powers against the eternal fight to the death with demons.

- Description from Novelupdates

Cui Heng was transmigrated to another world and the system told him that the new world he was in was a high-grade Xianxia world.