Spoiler (highlight to view)
A lot, but the main events ( the appearance of the brother, fiancee, etc) do take place. Layhe is wrong, the age difference is the same as in the manga.
I stopped watching it somewhere in the middle, and watched the last episode instead. Now I think of it as a totally wasted time.
The producents had plans for a continuation, but when they had finally got all the cast they wanted, they decided to do a new drama, Huan Huan Ai, instead.
This should be in the Akuma de sourou forum.
Still the bad cop.