About student ID card:

Full-time undergraduate and junior college students can enjoy a 2% discount when dining in Pizza Hut Happy Restaurant with their student ID card.

About the coupon:

If you enjoy the student ID card discount, you can't enjoy other discounts (except the free coupons given by Pizza Hut)

That is to say, you can't use the coupon and the student ID card at the same time

However, personally, I think that foreign fast food should be included in the "junk food", and it is better to eat less!