Shen Wan came back with memories of her past life and married into the town's Duke's mansion to celebrate the frail young master Xie Yujin. In her previous life, she was used as a pawn by the Shen family, paving the way for the real daughter to prevent disaster. She watched helplessly as Xie Jiajun and Jiang Jiajun were massacred by the Shen family and the imperial power. She also personally killed the only husband who protected her. After her rebirth, she put on a mask of gentleness and forbearance. In front of others, she was a "frustrated eldest daughter" with a low eyebrow, but behind her back, she was a top-notch "manipulator" with both medicine and poison.
I have seen several versions and this one is also wonderful.