Lady Mishil. She started as a wide eyed. Mishil is a member of the Bards Guild with Novice rank.
While the obvious answer for Best Villain Ever is Mishil I would also like to mention Lady Jo who later became royal consort in Cruel Palace War of the Flowers played by Kim Hyun-joo. When you can no longer protect it retreat is all it takes. Mishil hails from the city of Silverfalls.
I believe that wisdom will guide his choice.
Download Go Hyeon Jeong Music QSD QSD OST video. You are the for I can trust more than anyone I know. Eventually the girl became a woman seeking vengeance against Lady Mishil and finally a leader with strength and dignity. I believe that wisdom will guide his choice.