try zuji.com!

You can also try expedia.com. Your best bet when arranging your flight is to add on as many stops as possible and then maybe fly from the last one on a budget airline. Jetstar is a budget airline which flies from Singapore to Hong Kong. Not the most comfortable but the more stopovers you have the cheaper the flight. I imagine you'll be flying from Belgium which I don't think has a budget airline which has direct flights to Hong Kong.

also from here they advertise cheap deals to London on Air New Zealand, you can try to see if it works the other way too.

Woah you've been invited to filmart, awesome work P, so jealous!!

Please come bro!!!!!

Pedro, I might go there too!! Shall we meet up in HK?