It is very good show and very good plot. Very dynamic and interesting story. Wherever, it is true that it is hard to follow all characters, because it happens so much just in 12 episodes. I highly recommend to watch it with your native language audio, because it will be easy to concentrate on the story line. The three sisters personify the clash between morality and conscience and the pursuit of happiness and the good life through money.
Wi Haa Joon as Choi Do II is great actor and I really missed at least 1-2 romantic scenes with him and Kim Go Eun as Oh In Joo. If there were just a little bit touch of romantic, the show will be a masterpiece. Great cinematography. 8/10