I've watched over a hundred kdramas, and this is in my top 5. The story is about the relationship between a young piano prodigy and his mentor, and the piano playing is the best of any cinematic portrayal I know of. Their relationship is based on a shared love for music and his fascination with his very sophisticated mentor. She is in a loveless marriage, and gradually succumbs to his emotional directness and honesty. Those who are put off by the idea of a younger man/older woman relationship won't like this series for that reason, but anyone open to an unusual relationship should love the combination of sophisticated realism, romance, and great music.