ITTA is a social and communication app that allows KPOP fans to buy and sell used goods easily and safely. Developed by worldforest inc., ITTA offers a payment service that enables card payment and an escrow service that keeps money safe until the transaction is completed. The app also provides a seller account authentication service that eliminates worries about fraud.

One of the standout features of ITTA is its real-time translation and chat service, which allows users to communicate with global Deokme(mate) in their own language. The app also offers a 1:1 matching system that enables users to find someone within the same fandom when they want to make a Deokme. Additionally, ITTA has a bulletin board where users can communicate with each other in their own community, anonymously, or in secret.

ITTA holds various events every month for former fan club members from Deokhu to participate in. The app is available on Android and users can easily sign up with their SNS account. If users have any questions or concerns, they can contact customer support through the app's 1:1 Inquiry feature or by calling the representative number. Overall, ITTA is a great app for KPOP fans who want a safe and easy way to buy and sell used goods while connecting with others in their community.