I’m living in guangzhou (which is a neighbercity of dongguan). And I’m earning 2500 RMB/month. It’s OK but a little bit tight. If you would spend 5000~6000 RMB/month here, your life will be full of sunshine.
For Hongkong, 2500 will be a meaningless number, it means you’d better quit your job then to be a begger.
Last time I was in HK, I spent USD$10 or more for every cocktail I consumed. That place is a friggin money bomb. Won’t go again unless someone else is paying!