After the death of the late emperor, the vassal kings rushed from their fiefdoms to the capital. King Qin launched a rebellion with the support of his grandfather's capital camp, killed the prince who entered the palace and ascended the throne, eliminated the remaining vassal kings who had the right to inherit, and supported the young emperor. Li Cunzhen, a descendant of King Yan, escaped by chance and wanted revenge. The historical setting refers to the Rebellion of the Eight Kings, and the technological background is World War I + steampunk.
