By Dramabeans
Oh Sunny – an aspiring musical actress with a bright and cheerful personality. She became an overnight Cinderella after marrying the Emperor. In the palace, she fights to uncover the truth behind the death of the Grand Empress Dowager and topple the corrupt imperial family.
Emperor Lee Hyuk – Emperor of the Korean Empire. A powerful ruler who is well-respected by the people. He is talented and eloquent, but beneath his pleasant appearance lies an ugly personality.
(Ep 1–6) and Choi Jin-hyuk as Na Wang-sik / Chun Woo-bin – seeks vengeance on the Imperial family after his mother's death. To infiltrate the Imperial household, he changed his identity to Chun Woo-bin, becoming the Emperor's most trusted imperial bodyguard with unrivaled fighting skills.
Min Yoo-ra – Imperial head secretary. She is quick-witted, decisive and greedy. She is trusted by the Emperor and becomes his secret lover and mistress.
Empress Dowager Kang – Lee Hyuk's mother. A fearless and powerful woman who holds absolute authority in the palace and is fiercely protective of her status.
