So I'm looking for dramas where the female lead is either plotting and seeking revenge, redeeming her past grave mistakes, taking/restoring back her rights, saving the company/nation/kingdom, etc. The point is, she is doing some kind of ultimate mission. Her conviction and determination in doing this 'mission' is so strong to the point she would do whatever it takes to accomplish it, no matter how ruthless or immoral she becomes. I don't want her to stay pure and benevolent, but it's okay if she's only ruthless to her enemies and kind to her friends. At the same time she's also suffering inside, maybe because of bygone regrets, grieving for her loved ones, moral dilemma, not wanting to be the kind of person she has became, etc. I would really appreciate it if not only it has what I'm looking for, but it also has good plot and characterization and acting. Some romance would be a nice ingredient but not really necessary. I can take tragic or open ending. Thank you~