In the Great Liang Kingdom, at the Liu Estate in Qingzhou. Though sixteen-year-old Xiao Ling was the young lady of the household, her mother, Liu Shuang, was frail and her father had died young, so her aunt treated her like half a servant. She was thin and gaunt, with a sallow complexion. Her only distinctive feature was a pale red birthmark on the back of her left hand, shaped like a five-pointed maple leaf.
While gathering medicinal herbs for her mother, Xiao Ling fell off a cliff and stumbled into an "Yin-Yang Rift" hidden by dense fog, plunging into a completely different world: the Kingdom of Men. There were no women in this country; all things were yang. The people prayed to the "Father-Son Sacred Tree" for fleshy fruits, which were swallowed by specially appointed "Male Nurturers." They nourished the fruit for nine months with the saliva in their throats, then gave birth to baby boys by cutting open their abdomens.