The orphaned child of the Demon King was brought back and raised by An Wanggui, a sword cultivator of Cangchen Sect. She took the alias An Xun and called her adoptive father's daughter, An Ning, her sister. Though An Xun possessed extraordinary talent, she also bore a seal suppressing her demonic power. She grew up among her fellow disciples on An Yun Peak, gradually falling in love with her "big sister," An Ning.
During the sect tournament, the seal shattered and her identity was exposed. Unable to accept that her adoptive father was the "enemy who killed her mother," An Xun left without a word, leaving behind only this line: "We first met at Fengling Ferry, but after parting, we may never meet again in this mortal world."
She took the name Lin Ji in the demon realm, fought her way through mountains of corpses and seas of blood, and ascended to the throne of the Demon King. Four years later, when her adoptive father fell gravely ill, she sneaked back to deliver medicine and was discovered. Once the misunderstanding was cleared up, the long road to winning her beloved back began.
The Demon Venerable coveted the spiritual leyline of the Boundary River and sought to break the nine seals. Lin Ji and the people of An Yun Peak split up to repair them, while An Ning used her medicine spirit root to replenish the leyline. At last, the nine gates returned to their places, and Lin Ji slew the Demon Venerable with a single sword strike.
After the battle, Lin Ji stepped down as Demon King and settled on An Yun Peak, reporting to the window beneath An Ning's room every day at dawn. Everyone on An Yun Peak found their place, and Su Qingchen and An Li, Xie Qingyun and Jiang Yu, and An He and Chi Yu all found their own happy endings. Every year in the twelfth lunar month, Lin Ji took An Ning back to the demon realm to see the plum blossoms.
Theme: Protection and trust, identity and choice