Future. 20XX. Following rebellions in Russia and China, the White Night Empire was born, a massive empire spanning Manchuria, eastern Mongolia, and Siberia.

However, unlike other nations where democracy spread, the Empire chose imperialism. They discarded 21st-century advancements in favor of 20th-century civilization, rejecting modern technology and becoming a closed nation that controls all foreign entry.

Ultimately, due to the adoption of 20th-century systems and imperialism, the White Night Empire began to decline in less than a hundred years.

Furthermore, a great famine and abnormal climates caused by environmental destruction in other countries led to crop failures. As the lives of the people grew desperate, taxes rose and exploitation worsened, eventually leading to large-scale uprisings by commoners and slaves.

Those who directly opposed the Imperial Family were purged. However, revolutionary forces were secretly organized, building strength for a coup. Han Seo-kyung is a member of a faction that wants to maintain 21st-century technology and imperialism while revolting, whereas other factions advocate for embracing 21st-century civilization and adopting democracy.