Lady Mu

Mu was a very cunning woman as well as subtle and will do anything to get what she desires, going so far as to slowly kill Lady Hwa instead of giving her easy death just to feel superior to her and keep her jealousy aflame. She was spiteful towards Cheon Yeo Woon, hurling vulgar insults at him and his dead mother. Cheon Yeo Woon returned the courtesy by gifting Lady Mu with her son's eyeball and head.

She is the strongest amongst the wives of Cheon Yu-Jong. She was jealous of Cheon Yeo Woon's mother because Cheon Yu-Jong truly loved her more than any of his other wives so she planned to get rid of her using the micro poison while trying to place the blame on the Poison Clan. Years later, she tried to kill Cheon Yeo Woon many times, even kidnapping his foster father and horribly torturing him. Cheon Yeo Woon retaliates by dismembering her son and nephew before her. Shortly afterwards, he blinds Lady Mu, slashes her tongue and cuts off both hands. He then orders Lee Hwamyung and Huan Yi to kill her clansmen. Yeo Woon brutally finishes her off and pours virulent poison on her to frame the Poison clan.