When you are hungry, you can't use the red envelope with a reduction of 15 yuan for the first order. Generally, there are two situations:

1. The red envelope can only be used for the first order when you are hungry, but if you buy something once in the hungry restaurant, you are not a new user, and this red envelope can't be used.

2. At the same time, there are some stores that offer discounts on the first order, that is to say, in this preferential store, only one of the first order and the new user's red envelope can be used, and the other one is equivalent to being invalid.

if the above two conditions are met and you are hungry for takeout, the red envelope with the first order reduced by 15 yuan will not be used.