Awesome shot. So you are just flying your drone around and hope to not get catched? I do not want to concern you, but there are a lot of cases of people getting nasty fines after posting stuff like this, especially if you do it "commercially".. The never ending struggle of drone lovers :-/
No, actually in Hong Kong is completely legal to fly drone in the city as long as it is under 7kg. Anything over that weight you'd have to register and get a license for, but for the common drone, it's completely legal.
Wow, that is absolutely amazing! I forgot that this is the very place, that DJI is coming from ;)