During the Warring States period in China, Xin Li and Piao are two brother-like youngsters who dream of becoming Great Generals, despite their low status as orphaned slaves. One day, they encounter a man of nobility, who gives Piao an opportunity to undertake an important duty within the state of Qin’s royal palace. Parting ways, Xin and Piao promise each other to one day become the greatest generals in the world. However, after a fierce coup d’état occurs in the palace, Xin meets with a dying Piao, whose last words spur him into action and lead him to encounter the young and soon-to-be king of Qin, Zheng Ying.
Peringatan, series berjudul "Kingdom" di dalamnya mungkin terdapat konten kekerasan, berdarah, atau seksual yang tidak sesuai dengan pembaca di bawah umur.