As far as I know, there are five versions.
①The big box is considered a hardcover version. Includes a CD, free thermos cup, greeting cards, etc.
② Standard version, only one CD.
③Photobook version, including a CD and a "European Moments" photobook.
④One+one audio-visual value-added version, including a CD and a DVD. The DVD contains seven MVs and one hour of behind-the-scenes footage; free postcards and posters.
I have seen all four versions, and I own ③ and ④.
There is also a vinyl version, which I have never seen before. It is a limited edition and is very mysterious.