500 years ago, in the Eastern Continent, demons were causing trouble and people were living in misery. The righteous Qi Wuji led a group of demon masters to kill the demon emperor in the Peak Valley and bring peace to the world. But the blood of the demon emperor turned into the sea of karmic fire, dividing the continent into three kingdoms: Fulong, Qianyu and Julun. The demon masters used red beads to form a barrier to protect the creatures of the continent. However, 500 years of peace were broken overnight because of the damage of a red bead. Fulong Kingdom sent the young demon master Qi Xiaoxuan to find a new red bead to replace it, but the red bead was stolen and accidentally swallowed by a wild rogue Hu Zi, and the fate of the two was entangled. From the unpleasant encounter, the cold and hot temperaments, to the self-sacrifice in the battle to eliminate demons, and the mutual understanding after putting aside prejudice. Hu Zi was controversial because of his demon power. Xiaoxuan did not hesitate to disobey his father to protect Hu Zi, but at the critical moment of the national demon master competition, Xiaoxuan forced Hu Zi with a sword because of the curse of the "twin souls" in his body. After experiencing the darkest moment of the breakup, and then meeting again to track down the mystery and slay the demons, misunderstandings are resolved in tacit understanding, and the power of friendship is even stronger. The Fulong crisis, the Qianyu disaster, the peak battle, a series of mysteries followed one after another, and they went through the difficult moments together, and there always seemed to be an invisible hand behind it. This drama is adapted from Huang Xiaoda's youth hot-blooded comic "Tiger X Crane Demon Master Record".