In the northern frontier of the Dayin Dynasty, the wind was like a knife and the snow was like salt. For most of the year, it could freeze people's bones to the bone. There is an invisible line here, which is called the "Three Thousand Miles Border Wall" on the map. But on the ground, it is nothing but ruins and an endless wasteland. To the south of the line is Dayin, a behemoth whose bones have begun to rust after a century of founding. To the north of the line are tribes scattered on the grassland. They are like weeds, growing one after another, inexhaustible to burn, blowing and blowing. Sandwiched between the two are countless places like "Death Pass" - the names still carry the majesty of the past, but most of the people living in them are waiting to die.
