Well, this is a story that has, for me, a big difference.
Edmond (in the book) was a sweet lover and friend, a great human. Count of Monte Cristo is also the same but with a strong desire for revenge.
In this drama, Saimon Dan was a wonderful and warm groom, son, friend, etc. Monte Cristo is a bad man, driven by revenge and using innocent people to achieve his goals.

STORY - with some different characters and stories, but it is an adaptation of an amazing book of French writer Alexandre Dumas. I think the villains have a much sweet end...

ACTING - Wonderful acting!

MUSIC - very good. To hear songs like the hallelujah version of Jeff Buckley is always good.

REWATCH - will never do it. First, because I know the plot and the changes; second, I find some inconsistencies in Saimon Dan behaviour. How can he be a little redeemed when he find Kagura Rumi's motherly love and ask Sumire to abandon her daughter? That doesn’t fit… And what will Sumire do when she supposedly agrees to marry him, if he didn’t faked his death?

OVERALL - nothing new if you know this story. If you do not, I think you will enjoy a revenge drama!