The storyline was exceptionally well laid out and was very believable. I went thought many different emotions through the series but I would say the most common was sadness. I have watched a fair number of dramas but this was the only one that made me cry. From the start to the end all episodes were focused on the main story line. There was very minimal side stories that did not directly contribute to the progression of the lead story. The ending was also very satisfying. The acting was phenomenal. Combining all this really led to a very enjoyable experience.