They request to cancel the product, saying that they have not received it even though they have changed the mailing address. I also used a mini-letter and paid for the postage. Please be careful not to make the same mistake next time.
It seems that a fake name was registered as the address at the time of purchase, and the address was changed without any tidings just before the shipping notice. It was shipped under a false name, and as expected, it was returned to me with no address. I'm not sure what to make of it, but I'm sure it's worth it.