We pay attention to issues that can occur with SNS or matching apps. Every user can block & report others. Users' private information such as age, gender and birthdate can be registered optionally but will not be opened to the public. If you have any problems during the lesson, you can end the call in the middle of the lesson. Points will be charged only for actual calling time. Any complaints are accepted in the in-app inquiry or official twitter account. If we find a user has malicious activity, the account possibly be deleted.