Summary of the novel: An Immortal Sword forged from the essence of the righteousness of heaven and earth, a soul-killing sword that gathers ninety-nine million evil ghosts and undead, a battle between good and evil between heaven and earth. The astonishing young man Mu Yuchen wants to learn today's first-class swordsmanship and comes to the Fairy Flying Sword Sect. He meets a senior master by chance and learns peerless magical skills. He embarks on the road to save the world, eliminate demons and protect the Tao, and then joins forces with Feng. Ling Feng, the young master of the Thunder Escort Bureau, borrowed the cold spirit pearl from Yang Tianxue, the master of the Ice Palace, when he was subduing the Qilin Demon. Yang Tianxue secretly fell in love with Mu Yuchen, put aside his honor as the palace master, and resolutely accompanied Mu Yuchen on the road to eliminate demons and protect the way. He eliminated the poisonous fire evil dragon leader Long Yin, eliminated the demon demon master, and finally understood the ultimate holy heart sword in martial arts for the sake of the righteousness of the world.