Well I just got through watching it. As far as I can tell it has nothing to do with the first Man Wanted film.
Best way to describe it is as the HK version of the film 'GHOST'. Lots of romance, little action, and of course the dead giveaway of when you can see a 'GHOST' movie poster on the wall in a Triad apartment...
I will be posting a review shortly. It was good enough for fans of HK romantic dramas.