I didn't watch this drama for a long time, because the description put me off. It sounded boring and unoriginal. But when I finally started to watch this, I fell in love with it. It's unlike any other drama out there, surprising, and very good. The actors are great, and the plot is weird, at times funny, and really sad.
I don't know why the MAIN POINT of the dorama is not put into the description... well, perhaps because it would "spoil" the series... but honestly, if you're planning to watch this, here's something you would like to know, and I'll say it without giving away any spoilers; be prepared to a plot out-of-this-world, perhaps not quite scifi but close enough. But don't let that put you off; this is truly original and great to watch. My favorite dorama ever.