General's House: Her Hidden Blade

A businesswoman from a modern city wakes up as Qin Wanqing, daughter of the Qin house, and everyone around her goes on treating her as the girl who was there before. The girl she has replaced had been put out of the house along with her mother on the word of Yang Manxi, the concubine the father brought in. Yang paid men to kill the two of them and drop them into a well so that nothing would come back on her later. The girl's request is that the whole thing be settled, and the woman in her body takes it on. The father had gone along with Yang, the stepsister had worked at it too, and the mother's side of the family took the worst of it. She goes in as the daughter of the house and runs the revenge herself. A man she meets there takes her side, and the stepsister keeps putting traps in her way.