Also agree with other posters that in many cases HK breeders have terrible breeding practices and would approach any potential purchase of a dog in HK with great caution.
And, another question for the breeder - have they had any cases of parvo, kennel cough, distemper or other infectious diseases at their facilities? Way too many pups leave the breeder already infected with these terrible and generally preventable canine diseases which result in big vet bills and often death. If you read the HKDR blog, go back a few weeks and look at the story about baby poodle Button who had a life threatening illness and was dumped by either a breeder or owner on the street at a very young age.
Also, you can have a third party vet do a health check before purchasing, to make sure the puppy is up to date on it's vaccinations ( breeder should be keeping a record for you and the vet to review) and that it is in good general health. If the breeder hesitates I would see that as a red flag. The practice is common in the US and elsewhere.