Yes, 戀愛婚姻必修課 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.
戀愛婚姻必修課 is free.
To get estimated revenue of 戀愛婚姻必修課 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.