Whether you need to pay if someone else uses your Haidilao offer depends on your specific arrangements and negotiations.

Generally speaking, if your friend borrows your Haidilao student discount, then they should be responsible for paying for the meal.

This is because Haidilao student discounts need to be bound to student status and can usually only be used by the students themselves.

However, this is only a general situation.

In specific situations, you and your friend may need to negotiate further to determine who will pay for the meal.

For example, you might consider splitting the cost based on the cost of the meal, or deciding how to pay based on how much each person enjoyed the meal.

In summary, you need to respect each other's wishes and negotiations while enjoying your meal to ensure a fair and enjoyable dining experience.