The Newlywed Princess Goes on a Tryst, and I Awaken the Killing System

In this world, there are immortals who can call the wind and rain, and move mountains and seas; there are demons, who can burn the sky and boil the sea, and destroy the heaven and earth; there are also mythical beasts and demons who are born with strong blood and inherit demonic magic from their palms; humans are innately weak, and they can transform by practicing martial arts and Confucianism... Cui Baiyu, the son of the Demon King of Yanyang Town, and Xiao Yuyan, the seventh princess of Yanyang, were childhood sweethearts and had been married since childhood. However, on their wedding night, Xiao Yuyan drank and had a good time with Yang Pingzhi, who had repeatedly plotted to frame him, and left his consort aside...