The world-famous Dragon Teeth Knight, Tiger Head Officer, Golden Eagle Hunter, Xuanwu Celestial Master and Holy Light Ranger serve as the elite of the dynasty and fight against the mortal enemy Canglang Empire to establish the immortal empire. The knights are all selected from the noble children of Dongjun Kingdom. They learn the art of dragon training since childhood and swear allegiance to the king of Dongjun.
In the 400th year of Guangming, the third prince Shang Shuo killed his brother and usurped the throne. Fearing that King Dongjun would lead the four vassal states to revolt, he trapped King Dongjun and all the Dragon Tooth Knights under his command at Burning Sword Cliff, and took away the dragon "Mocking Wind" and controlled it. The "Moofeng Spirit Fang" of Chaofeng disappeared out of thin air. Shang Yue sent his army eastward to search for the spirit tooth and massacred the entire Dongjun royal family and dragon clan. The infant son Jun Yu became the only survivor with the help of Water Lily Hemu.
Shang Shuo announced that there would be no more Dragon Teeth Knights in the world, and the high priest Yuan Cai suddenly committed suicide. Before his death, he left a prophecy: "Eighteen years later, Dragon Teeth will return, and the Green Dragon Age will soon begin..."