Hong Gil-dong, who was impressive in hanbok, a traditional Korean costume, was talented in both civil and military affairs, but even his official career was blocked because he was a child of a concubine. Hwalbindang was founded to prevent the tyranny of Joseon corrupt officials, while keeping the resentment of Hu Bu-ho, who could not call his father his father and his brother his brother. It is a versatile close-range mercenary who uses light technology that runs fast in the air, Muyeonggak that raises a fallen object, Kwanggak that strikes an object with a fist, and wheel skill that rotates a rod to strike, and confuses the battlefield with newcomers through self-immolation.