Three years ago, Yin, and Zhao lived together in a nomad settlement. The three of them were close childhood friends.
The sisters loved Zhao like a brother, but that eventually turned into romantic love.
While playing in the field as usual, they discover a broken construct.
Zhao is drawn to the workings of the strange machine.
Meanwhile, in the Taibai Empire, Chief Engineer Mo Heng is working on Zhengtian, the ultimate weapon.
Four hundred years ago, beginning
 with our old enemy the Taichen,
"قبل 400 سنة، بدايةً بعدوّنا القديم "تايشين
Vor 400 Jahren
Hace 400 años, empezando
con nuestros enemigos, los Taichen,
Hace 400 años, empezando
con nuestros enemigos, los Taichen,
Depuis notre victoire
400 anni fa, iniziando da Taichen,
 il nostro vecchio nemico,
Quatrocentos anos atrás, começando
com nossos antigos inimigos, os Taichen,
Четыреста лет назад, когда мы нанесли
поражение государству Тайчень,