Shin-ah Lee is a princess of the Republic of Korea, a constitutional monarchy, but is also an illegitimate child. The gossip that people around her say is evidence of an affair still hurts her. Then one day, Shin-ah is falsely accused of inducing a student at her school to commit suicide, and she uncovers the truth with Han Tae-kyung, who becomes Shin-ah's new bodyguard... Shin-ah and Tae-kyung's relationship grows closer amidst the tension and mysterious enemies that threaten the royal family.