After being used for her poison skills, MC is killed by the 3rd prince to give away her heart to his consort aka her sister. She wakes up in the body of the general's daughter who commits suicide at the same time because she doesn't want to get married to the 5th prince. ML is not stupid actually and that's only his disguise to make people underestimate him. ML wants to get justice for his mother while MC wants revenge against the 3rd prince.