Liang Chuan, the Tianjian Sect's number one genius for over a century, was lonely, cold and arrogant, and was known as the "Ruthless Sword Master". Three years ago, he was ordered to accept the demonic saint Su Daji as his disciple. On the surface, he was strict and cold, but in fact, he secretly helped her change her ways. Su Daji appears to be well-behaved, but in reality she is sinister and cunning. She spends her days thinking about how to "collapse her master's character." In an accident, Liang Chuan discovered that Su Daji was her old enemy who killed her in her previous life, and she was also looking for a secret - why did the master always protect her secretly, but never meant what he said? When the righteous way and the demon sect clashed, the love-hate entanglement between master and disciple gradually surfaced. Liang Chuan's mask of indifference was torn off again and again, and the truth gradually emerged: they were destined to love and kill each other, but they had to depend on each other for life and death. However, a bigger conspiracy is brewing, and a secret about reincarnation is about to be revealed...