Chenzi (played by Louis Koo) went to the foot of the mountain to distance himself from the warring mortal armies. On the way, he met Cheng Letian (played by Zhang Ziyi) and Xuantianzong, but unexpectedly discovered the secret of the blood demon's comeback. Because of the "Sun and Moon Golden Wheel" that has been imbued with a lifetime of skills and the strongest sword in the human world, the "Southern Dawn Fire Sword", it is possible to eliminate the evil Youquan Blood Demon. A battle between good and evil is about to begin...