Whosfan is a mobile application designed for K-pop fans worldwide. It is a platform that offers services such as Hanteo Chart, album authentication, voting, events, K-pop news, global fan chat, and star channels. With Whosfan, users can check out the Initial Chodong sales amount and graphs in real-time, Physical Album Chart, Digital Chart, Global Authentication Chart, Music Chart, and Star Chart. The platform also allows users to authenticate their albums with HATS cards provided when purchasing a K-pop album. The authenticated albums are reflected on the Global Authentication Chart for the artist, and users will earn credits as well, protecting their favorite artist's copyright with genuine album authentication. Whosfan offers several voting options that global fans can enjoy, including fan ad voting, music show and award ceremony votings, and official artist voting, among others. The platform also provides K-pop news and a global chatting service called WhooK, where users can communicate with fans worldwide. Users can purchase Whosfan Coin on the app, and the pricing differs by product. Whosfan requires access rights that are essential for using the app's service, and it asks for consent for optional access rights.