After her rebirth, Su Mianmian swapped marriage choices with her sister Su Qingqing, who stubbornly insisted on marrying an honest man, and entered the wealthy merchant Pei family as a concubine. Outwardly compliant and submissive, she secretly saved money and plotted her exit strategy. On the eve of the Pei family's bankruptcy, she made off with her savings, founded the Su Ji Embroidery Workshop relying on her embroidery skills, and saw her business thrive day by day. Her down-and-out ex-husband Pei Yunzhou, seeing her business success, grew resentful and jealous, and tried to extort her using commercial secrets. Su Mianmian calmly fought back, first exposing his old background of running away with embezzled funds to cut off his lifeline, and then setting a trap to capture Pei Yunzhou on the spot when he broke in to commit crimes at night, sending him to the authorities and completely defending the family business she had built with her own hands.