Su Wanshuang, an orphan from the Jingbei Marquis Mansion, lives in the rivers and lakes anonymously and makes a living as an embroiderer in Yunqi Town. Half a volume of the family biography "Hanmei Knife Manual" and a pair of parallel lotus silver locks are the only remaining clues to her life experience. She used her delicate embroidery skills to embroider the warmth of her neighbors, and used unfamiliar knife skills to protect the tranquility of the city. During the years of growing medicine gardens, opening an embroidery workshop, and managing her household, she gradually got to know and cherish each other, the reclusive doctor Shen Yan. When various factions in the world came together due to the legend of the "Jingbei Secret Key", she struggled between protecting the town and pursuing the truth. Finally, she used the method of "embroidering the heart to hide the edge" to uncover the old case of the injustice of the good and the good twenty years ago, and also found her own "jianghu" in ordinary daily life.
