Yes, YBM 픽토 : 진짜문제 is completely free and it doesn't have any in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
YBM 픽토 : 진짜문제 is free.
To get estimated revenue of YBM 픽토 : 진짜문제 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.