Since Lee Zicheng’s invasion of the Forbidden City, the Chongzhen emperor has resisted all the way and finally hangs himself on Meishan upon his failure. Princess Kunxiong (Changping) vows to keep the Forbidden City from falling in to the hands of traitors, but is at a loss for what to do. Only by finding the legendary Dragon Sword, can she solve her dilemma.
How will Solar who is involved in the war defeat the legendary beasts, namely Qiuniu, Yazi, Jiaotu and Taotie? What should Bixi, the sixth son of the Dragon King who shares a brotherhood with these beasts and also a friend of the princess do?