The exchange process took a very long time, and there was no information that it had to be exchanged at the grocery store, which turned out to be located under the stairs, and the space was very small. There were a lot of people queuing because it was the holiday season. After waiting for a long time, I realized I was queuing at the BNI Wonder counter, so I had to queue back up because I couldn't exchange at the BNI Wonder counter. No one told me it was the BNI Wonder counter either.