The polaroids are apparently prizes for Japanese WIN fans. They have to fill up an application to get the cute polaroids of the boys!
Put your application ticket on the postcard after specifying ur chosen member:
1. Address
2. Name
3. Age
4. Phone
5. Occupation
6. Reason
Photo Credit: seunghi95 | jinwoosgirl | aiaiaaa_ko
Thanks for cheneechee for the translation
WLSY 