I'm not a big fan of supernatural themes but at least this one sets some ground rules and sticks to them. The main storyline is very engaging, I was totally hooked and couldn't wait for the next episode. I'd give this a 10 if it were edited down to a 2-hour movie but at 16 episodes there's plenty of padding and way too many comic relief characters. The tone is a bit uneven, shifting abruptly from serious melodrama to satire. The main character, Professor Cha Young Min, spends most of the drama in a "ghost coma" and, given all the padding, it would have been more interesting to resolve his coma a few episodes earlier, expanding the secondary story of Intern Seung Tak to see him evolve as a surgeon in his own right. I think other viewers would agree that we were rooting for him to succeed but the conclusion of this storyline doesn't quite deliver. And given all the padding I think the audience would have enjoyed seeing the bad guys face the jury and hear the prison door slam behind them as they were being placed in their cells. After 16 hours all we got was a routine arrest. We don't even know if they got their "just desserts." Overall, highly enjoyable with. a great cast and high production values. The special effects were nicely done.