A bit player who once used to be a popular actress is suddenly transported into another world in ancient times. While she is shooting a film, she comes across a mysterious-looking bronze mirror. As soon as she looks at it, she wakes up in the body of a young girl called Sieun Ma, the eldest daughter of the Prime Minister, who is the most powerful in the country. Sieun was notorious for her ruthlessness and cruelty, feared by her sisters and servants alike. Her sisters even call her a “monster” because of her personality and the big scar on her face. Sieun is said to have worn a mask, most likely to cover it. But now that a different person is in her body, will she be able to change? And will she be able to put up with her jealous sisters constantly conspiring against her?