Green Silk Poison Needle: Ten Years of Mystery in the Embroidery House

On a rainy night in late spring, Shen Zhiwei, the legitimate daughter of the Shen family's embroidery house, was killed by a poisonous needle. She was holding half a piece of plain silk with the word "green" in her hand. The maid Chuntao was suspected to be the murderer. Distant cousin Su Wan suddenly appears to solve the case, but she digs out a secret message on the embroidery frame, a poisonous prescription, and half a piece of gold foil with the word "Lu" in the bronze mirror - clues pointing directly to an old silk smuggling case ten years ago. The "Qingdengfang" traced by the headman Lu Zheng was burned down, and the shopkeeper Qing Niang disappeared; the Shen family master confessed that Shen Zhiwei was actually Qing Niang's daughter. When Su Wan testified that Agent Li was the real culprit, he revealed it with his jade pendant: "I am Shen Zhiwei, and the deceased was Lu Zheng's chess piece." The murderer recanted his confession, the young lady was "resurrected", and there was a greater power behind the smuggling case. Is that half piece of plain silk with the word "green" a distress signal or the key to the sins of two generations? Among the people in the game, who can find out the final innocence?