Su Xiuchun, an orphan girl in the embroidery workshop, was involved in the secrets of the world because of her embroidery of "A Hundred Butterflies Wearing Flowers". She was mistakenly identified as a remnant of an enemy by the mysterious swordsman Zhan Shenbi. The two went from being at war with each other to jointly investigating a twenty-year-old murder case. Xiu Chun used embroidery skills as an edge to solve the mystery, and Shen Bi used sword bones as a shield to protect him. In the conspiracy, feelings gradually arise, and it is finally revealed that the real culprit in the family massacre that year was actually the "Tianshu Alliance" who claims to be righteous. The two work together to overturn the hypocritical world, reestablish a new chapter of chivalry in commoner bodies, and form a pact of "embroidering swords and sharing the same heart."
