The Poisonous Legitimate Daughter Is Fierce and Stunning

Xia Wanran, the ace assassin of China's Night King organization, is blown to pieces during a mission, only to have her soul transmigrate into the body of the eldest legitimate daughter of the Duke of Ying's household in the Mo Kingdom, who has the same name as her. The original owner was poisoned in the womb and lived in constant misery. She was frail and dull-witted, beautiful but utterly lacking in charm and spirit. She had been engaged to the eldest prince, the Prince of Li, since childhood. They agreed to marry once she came of age, but the Prince of Li left for two years to put down a border war. On the day he returned, he had a princess from Beichen in his arms and broke his promise, demoting her to a concubine! Does he think women are vegetables in his family garden, free to pick as he pleases? As a formidable assassin from a foreign land, she won't tolerate a mere prince humiliating her like this. She wouldn't want to be his secondary consort, let alone his primary wife. In fact, she'd rather take the throne herself and enjoy being called the Empress Dowager. What's with that idle Prince of Chen? He's so aloof and noble, so why won't he stop clinging to her? It turns out they have a long history together, but because the heroine was so deeply poisoned, some of her memories were sealed away.