Yes, 주식인 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.
주식인 has several in-app purchases/subscriptions, the average in-app price is 3,841.80 ฿.
To get estimated revenue of 주식인 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.