If the hotel or teahouse serves wine:

Guests usually give red envelopes as gifts. The content of the red envelope has no specific figures, which is meaningful to people. You can get more if you have money, usually one or two hundred. You don't need to write your own name, so it's not necessary.

If wine is served at home:

You can send one or two cans of milk powder or wine together, and the number of red envelopes can be less, without writing your own name. Guangfu people in the Pearl River Delta (that is to say, Cantonese people) also have the habit of returning gifts. Generally, it is a red envelope, and the number in the red envelope is very small, such as ten yuan. In return, you must accept the gift.