Yes, 成语王——闯关挑战赛 is free to download, however it contains in-app purchases or subscription offerings.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
成语王——闯关挑战赛 has several in-app purchases/subscriptions, the average in-app price is 5.44 ₩.
To get estimated revenue of 成语王——闯关挑战赛 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.