Many designers are worrying about one thing: how to make a game both fun and profitable? How to balance the relationship between? There is no absolute truth in the world. Any truth can only take effect in a corresponding context, same on this issue. To achieve both playability and profitability, you need to find out who your target users and agency will be, and what the target of company's current strategic requirements will be. There's no perpetual motion machine in the world, and the games are not always self-loops as well. If a game is able to bring a longer period of time of wonderful experience to the target users, and help the company develop to the next level, then it's a great product with success. This talk will focus on how to make numerical design, premium design, and how to achieve the balance and trade-offs between both.