It is a time of great upheaval and rapid modernization, with conflict brewing between the two leading political factions, the Sugu (conservative) and the Kaehwa (enlightenment).

Those on the Kaehwa side support Gojong's enlightenment policies during this time of change; Joseon was known as a hermit kingdom through the nineteenth century, keen to isolate itself from foreign influence.

In previous years, Joseon had rejected Western overtures to open trade lines, which had led to military clashes with American and French forces.

Adding to the mounting tensions, recently Gojong's Kaehwa supporters have begun, one by one, to fall victim to a mysterious figure toting a brand-new style of gun.

After the tragic death of his father and the enslavement of his younger sister, Yoon-kang trades his sword for a Western-made lever action rifle as he embarks on a revenge mission, but ends up becoming a hero for the people.