MTL - Poisoning the World: The Secret Service Mysterious Doctor is a Young Beastly Wife

She is a top-class spy, a poison specialist, but also a young and cute girl with a sinister temperament. In spite of her sweet and innocent appearance, she can complete any tasks without the slightest hesitation. One day because of an incomplete black magic, she was sent into the body of a girl who was deemed as a good-for-nothing. What kind of change will she bring to this continent?A Prince said with bitter hatred, "I thought she was weak and easily bullied, therefore I broke off the engagement. I really didn't expect she is such a shrewd girl. I made an error of judgment."The Crown Prince deeply sighed, "She is such a sexy evildoer! Obviously, she has a frail and tender body, but I am not able to overwhelm her"Finally, an Emperor hit the nail on the head, "She is just a bit two-faced!"She answered, "You're just a big pervert!"The Emperor carried her into the room and said, "You are predestined to be mine! A two-faced girl and a pervert are a perfect match, right?!" - Description from Novelupdates