Finally, got a chance to read the book and I think I definitely prefer the drama to the book.
There seems to be more layers of emotion in the book but I prefer the way the drama is written more. Some relationships and character endings left me rather unsatisfied or heartbroken. Someone previously mentioned that Runyu got a better ending in the drama, and I was like, "him dying was a better ending?" After reading about his ending in the book I would definitely agree. He didn't die in the story, but he went crazy and never redeemed himself.