Experience amazing AR (augmented reality) by downloading the 'GG go' app and using it to view the picture on the coupon.1) Search for 'GG go' app in the app store or use the QR code.2) Install the Trick Eye app for free.3) Tag the coupon picture to experience AR for yourself.“Gyeonggi-do Coupon Book” is a book that provides explanation for easy and convenient touring in Gyeonggi-do using subways and public transportation. You can make trips to tourist destinations in Gyeonggi-do at cheap prices.