I really liked the drama itself, especially the first 25 episodes but the ending was so sad that I wouldn't have courage to rewatch it. I normally don't watch dramas that have sad endings but when I started this drama it was so good that I couldn't help but watch until the end. For some character deaths I can understand why they die but for some it feels like they died just to make the ending more dramatic. If you think how the first 20-25 episodes no one died (even though the events was just as dangerous) the last 10 episodes feels like they don't belong to same drama. Of course it is just my thought. I would still recommend people to watch this drama as it is really a high quality drama with great overall story, acting and characters.