Yun Wan, the abandoned daughter of the Yun family, was sent to a Taoist temple since she was a child. She was called to practice, but she was actually exiled. Ten years later, in order to cling to the first immortal sect "Tianyan Sect", the family wanted to marry their legitimate daughter to the legendary young sect leader of Tianyan Sect, Li Yuan, who had lost all his cultivation and was not going to die soon. When the legitimate daughter refused, the family forcibly recalled Yun Wan and forced her to marry in her place.
On the wedding night, everyone was waiting to see Yun Wan become a widow and a laughing stock. Unexpectedly, Yun Wan sensed the pure and powerful ancient sword bone breath in the dying Li Yuan's body. This was the perfect "scabbard" and "cauldron" of the "Ruthless Taoist Sword" that she had practiced hard for ten years. Instead of escaping, she took the initiative and used her sword intention as a guide. She not only saved Li Yuan's life, but also used the sword bones in his body to break through the last shackles of her own cultivation.
From then on, what the world saw as a joke marriage of "a loser marrying a loser" has turned into the most frightening powerful alliance. Yun Wan is no longer an abandoned daughter of the family who can be manipulated by others. She holds a three-foot green sword and slaps the elders who despise her in the Tianyan Sect, exposing the hypocrisy of her sister-in-law and clearing her name. When the family tried to use her again, she cut off all her relatives with one sword and declared: "My life never belongs to the Yun family."
She and Li Yuan, from a "contracted couple" who took advantage of each other, gradually developed a real love in the crises of fighting side by side, fighting against the internal fighting of the sect, and resisting the invasion of outside demons. In the end, Yun Wan relied on her supreme swordsmanship to help Li Yuan reshape his meridians and reach the top of the immortal path, and she herself became the immortal legend who can change the color of the world with a single sword.
