XY is a common unknown in mathematics
XY is the chromosome that determines sex
XY is Lin Xia and Long Ya
modern overhead
The world divides human beings into two parts based on genetic merit and sets up different living areas.
Lin Xia, the adopted daughter of the chairman of the Lu Company, was ordered to go to a human settlement with inferior genes to find an employee who disappeared during the mission many years ago. She unexpectedly met Long Ya, and a series of stories began.
Intention: Simple and upward