Sixteen years ago, Fairy Lingyue, the master of the Moon Cave in Hanshan Mountain, picked up a dying baby girl in the snow and named her Su Ningshuang. After more than ten years of hard training in isolation from the world, she learned the "Han Yue Sword Technique" and "Leng Yue Heart Sutra" in the cave. Her temperament is as calm as a cold pond, but she also has the purity of being ignorant of the world.
Before his death, the master handed her a mysterious "Han Yue Order" and a letter, and asked her to go to Suzhou, Jiangnan, and deliver the letter to Mr. Murong, the owner of "Tingyuxuan". With her master's last wish and a trace of her life experience, Su Ningshuang stepped into this troubled world for the first time.
When she first entered the arena, she encountered Black Wind Duel in Luoma Town and robbed people of their property. She tried to help him but ended up being killed. A night attack made her understand that the world is far more dangerous than she imagined - there are both the ruthlessness of the evil sect and the hypocrisy of the righteous; there is the kindness of chance encounters and there are also deliberate calculations.
Along the way with scholar Liu Wenxuan, she was chased by Black Wind Duo and involved in the fight for martial arts secret treasures. She even unexpectedly discovered that the truth about the catastrophe in the martial arts world thirty years ago was hidden behind the "Han Yue Order", and her life experience seemed to be closely related to that catastrophe.
The cold Hanyue Sword illuminated the blood-stained official road, reflected the deep secret valley, and also reflected her gradually awakening edge. From being passively involved in disputes to actively exploring the truth, Su Ningshuang, with an innocent heart, adheres to morality amidst the light of swords and shadows, and tempers and grows in the treacherous human heart. How will she use the sword in her hand and her will to carve a path in the turbulent rivers and lakes, uncover the mystery of her life experience, and let the light of the cold moon illuminate those corners shrouded in darkness?
