Define the Relationship DTR Official Exclusive Postcard Set For Sale

Define the Relationship DTR Official Exclusive Postcard Set. I got a spare set while buying batches of pre-owned DTR merch. They originally came with Volume 4 of the Korean book release, I believe, but don\'t quote me. All eight postcards included.
I\'ve only personally taken these out to take photos, but please note that they are pre-owned so may have minor flaws. No issues from what I can tell. I don\'t offer returns, so please check photos carefully.
I might take a second longer to ship these than other things depending on what packaging I have available. Just want to make sure they get there safely.