Three reasons for this drama is a must see:

1. The soundtrack is a master piece. Actually, I came to watch it because I liked the music very much
2. The story is keeping you alert, it goes several time in unexpected directions.
3. The acting is excellent, not only for the main leads.

A drama that is worth its watching time.

I have not seen the original K-Version; it should not matter too much if you saw it,
because at least two of the previous reasons stand by themselfs.