The Reborn Wife Destroys All

Sophia is married to a man who is unfaithful to her, and the woman he is seeing is her closest friend. In her first life the two of them killed her, and she died without knowing it. She is reborn with her memories and at first still wants to save her husband. Her mother is the one who makes her look again, and points out that he never had any intention of saving her. Sophia stops trying. She goes along with the two of them, keeps their trust, and takes apart what they have built. She decides her life is not worth spending on people like that, and that being given it back means using it on herself.