This is a very good drama with all the right ingredients:
The cliff
The spitting blood
amnesia (not long)
lots of couples
A slight love triangle (not very long)
a very happy ending

What's special is the plot, which is very elaborate and well developed over the course of the episodes.
There's a good balance between the investigation and the romance.
The actors are all very good, with Xu Zheng Xi (Jeremy Tsui) being particularly charming.