so apparently this is the sequel of...
the detective (2007) and the detective 2 (2011).
i didn't realize that until the flashback showing the death of liu kai chi (which took place in part 2).
part 1 was nice with the supernatural twist at the end, but part 2 was weaker and part 3 was also a disappointment.
we need more supernatural twist, i don't watch the detective (1/2/3) for the normal detective work -_-