The drama is adapted from a comic book and tells a fantasy costume romance about a man with opposite dual personalities and a woman who likes him, going back and forth between refreshing love and vicious obsession. Park Ji-hoon plays a man with dual personalities, who truly falls in love with a woman and knows why she needs to live, and a man who believes that long-term obsession and jealousy are true love. Hong Ye-ji plays Lian Yue, a woman who went from being an assassin to a concubine and captured the hearts of two personalities.