Drama of worth watching. But one negative point. A typical cliffhanger. The ending is annoyingly hazy. Overall the story is about three high schoolers who go to the same school (maybe same class as well). They all undergo organ transplant (of heart, some leg muscular tissues and eye cornea) and their donor is the same, a guy who was murderer but the case was closed as an accident. His sister, an organ donation coordinator and doctor is the one who stays with, takes care of and observes the three for 6 months. Later, it is shown how they solve some mysteries together and also find the murder of their donor. You can find it on dramacool and youtube easily and for free. Also it's available on viki but only under subscription. The acting was not bad at all, all the actors showed the emotions and expressions of the charecters well. A nice and short drama with genre of mystery and crime. Also, this is a no romance one. But I really didn't like the ending. It was too good to have such an abrupt ending. I'll wait for them to have a Season 2 with a proper ending. Let's see. You can easily complete it in one day. Maybe even a couple of hours. [I completed it in 2.5 hrs] ; )