that card is a lucky dip card for buyers of her Guilty album, released from AVEX HK.
if you have a letter like F in the centre of the card, you would win a free gift. could be poster, notepad, towel, etc.
however, those can only be redeemed from some agent based in HK.
so, unless you live in HK, or happened to be go there, or able to mail out fast to someone u know in HK, then no point for it...
if i remember correctly, the redemption ends on 5 Feb already.
see
www.avexasia.com
click on the small Guilty gift promo pic near the bottom of the page.
(posted by kenshin79 on Ayunite)
so I guess we are all to late :'(