2 visas in a row

Yes, you are allowed to do that. It can happen that you are asked about the reason why do you take two visas in a row, but you should just have some logical explanation lake cheaper hotels and food than in Hong Kong and similar, but you can also say that you have not seen and tasted everything you wanted during the first five days and also that you want to do some comprehensive shopping that you did not manage to do during your first five days or similar. Just be polite and relaxed and you will be granted a second visa without a problem.