After the Legitimate Daughter Was Reborn, She Stole the Concubine's Marriage

[Atypical Daughter + Rebirth and Revenge + Self-Strategic Male Protagonist] In his previous life, Cheng Ruoyun had no defense against his concubine and fiancé, but in exchange for this, the two of them joined forces to plot against each other. They caused the tragic death of all loyal members of the Cheng family, and then sent her into the enemy camp just to disturb the eldest prince's mind. When I opened my eyes again, I was back to the day when my concubine and the eldest prince got engaged! The engagement is suspended, she does not agree to this marriage! In her next life, Cheng Ruoyun said that her mental state was very bad and she would go crazy and kill everyone equally. What? Someone stole her money? Someone poisoned? Someone scumbags her best friend? Sorry, everyone is dead. Concubine: Sister, don't you love me anymore? Fiancé: Yuner, you have changed! The eldest prince Wei Zhou, who was reborn a little late:? ? What am I missing?