Usually i prefer modern drama over historical. But this drama really impressed me. There are only 8-9 drama historical which good.
Story start with female lead who wear secret masked girl lady help other. Female lead window. She stay whole in house to pray for her dead husband and in night she left house to help other. Her brother get disappeared 15 year ago. Then rich minister take care of her and tell her marry his son at young age. After marriage her husband die immediately. Female lead acting is superb, also her stunts, martial arts also good but don't like her cause she look too old as compared to male lead. She looks like his mother. They should have to cast other female actress.

Male lead acting too good and he's so handsome. Ml is police officer who get adopted by family due to his whole family die in one incident. Other supporting caste also best. I love fl maid and ml brother's lovestory. Fl lead maid also smart and supporting.
Story really nice. First fl and ml little argue with each other. When they know each other properly then try to protect each other. They slowly fall in love with each but due to she is window, they tried hide and control their love.
Fl mother law really nice and strict. Her strictness add interesting factor in drama. Father in law show good initially then his real face come out.