Scary movies is something that HK cinema has a difficult time with in my opinion. I think because it is so difficult to get people to part with their hard earned dollars, they must provide a little bit of everything in their movies - which is why so many of them are good... they want to make you laugh, cry, and every emotion inbetween... it's a difficult habit to break though and usually when they make genre specific films, they try to insert drama, humor, romance, action and special effects in.
This film is no exception - could've been a good film, but it just falls apart and gets too silly. It was also done very cheap - even for HK standards - considering the budget this script asks for. Assuming there was a script... it seemed to flop all over the place like a Simpsons episode. I didn't hate it, but I was disappointed. It'll be awhile before HK takes the crowns from Japan, Korea and Thailand when it comes to horror.