There was a fire in the crown prince's womb three months ago, and the life or death of Prince Li Jin was uncertain. The Haitian Magic Box hidden in the deep palace was split open by the Hua Ran Sword, which had disappeared for many years and reappeared in the world. The demons sealed in the Haitian Magic Box were scattered in the world. In ancient times, the Youyue Demon drove his demons and monsters to wreak havoc, and the people of the world suffered from the demon's poison. The War Saint Mu Hua lit the seven-star serial lamp and spent seven, seven and forty-nine days to refine the Magic Locking Jade and the Sea and Sky Magic Box to seal the Youyue Demon. He also sealed the leaderless demons and the Magic Locking Jade in the Sea and Sky Magic Box, so that the world could once again be peaceful.
When the Haitian Magic Box was destroyed and the Magic Lock Jade was stolen, the three major sects in the world, Liuxian Alliance, Huanzhen Sect and Iron Gate, were also entering Chang'an City of the Tang Dynasty.
With the disappearance of the crown prince Li Jin, the battle for the throne has become even more imminent. The fourth highness, Prince You, Li Cheng, the sixth highness, King Mu Li Wu, and the seventh highness, Prince Lu, Li Zhan, are all secretly vying for the throne.