Most of great dramas are loosing their rythm and their greatness because they have to stick to a specific numbers of episodes, so in the last 4 or 6 episodes (hen it's not last 10 episodes....) it's getting slow, slow, sloooooooow and boring when the beginning was Great, thrilling and exciting! The big advantage of this mini-drama is that it's short (4 episodes) - so the rythm is crazy and thrilling till the end. You would say - yeah sure it's a mini-drama - but with from Sirius something amazed me: 1. I got amazed by the main actor, able to play the role of 2 characters so different in attitude, look, behavior (It made on me the same impression that the AMAZING actors performance in "Kill Me, Heal Me"). 2. The scenario is not cheesy, it's straight to the point. And also full of contrasts. Those who like scenarii talking about morale, about Good or Bad, you would like this mini-drama. More than a Twins story, it's all essential life questions that are emphasized in this drama in a direct or indirect way. Twins, Yin-Yang, Good-Bad, Happy-Sad, Black-White, all those contrasts keep you tense till the end and make this really great alchemy in 4 episodes. Great job! :)