In the distant past
A world that perished but barely survived.
Through the city walls that cover all countries and reach into the sky, people can directly see the world around the borders.
The field of human activities is limited within this wall, and almost all people are born and die without being able to see the outside world.
The calm on the surface is reassuring, but inside it is rotting, and the world is slowly heading towards destruction.
In that closed world, on this day, Gu Cheng, a young man living here, met a girl who suddenly appeared and called herself Ouyang Xue.
Gu Cheng and Ouyang Xue, who lived together in a semi-forced manner, unknowingly connected with each other...
Concept: Two people who love each other should work hard to stay together no matter what.