She is the secret service's trump card, a poison specialist, but also a young and cute girl with a sinister temperament. Contrary to 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 waste of resources. What kind of change will she bring to this continent? A certain bitter and hateful Prince says, “I believed she was weak and easy to bully, therefore I broke off my engagement. Only, I didn't expect she is a poisonous shrew. I made an error of judgment.” A certain Crown Prince deeply sighs, “She is such a sexy evildoer! Obviously, she has a frail and tender body, but I wasn't able to overtake her…” Finally, a certain Emperor hit the nail on the head, “She is just a bit two-faced!” She answered, “You're just a big pervert!” A certain Emperor carried her into a room. “Then, you are meant for me! Two-faced and pervert, that's a perfect match!”