GRAVITY Co Ltd

2. Basis of Presentation, Continued

(2) Use of judgments and estimates, Continued

(a) Deferred revenue

The Company sells virtual currency and in-game items that can be used in mobile games to game users. For each game in each country, the Company estimates and applies the game user's life cycle in order to recognize revenue generated by micro-transactions. The game user's life cycle is estimated based on the average period from the game user's first payment date to the last access date for active paying game users. The Company considers a game user as an active user if the period between the time of the user’s most recent access of the game and the end of reporting period equals or is shorter than the estimated game users’ life cycle. For remaining amounts of virtual currency and items that active users own at period-end, the related revenue is deferred considering the items’ attributes. The Company estimates the user’s life cycle by analyzing game users’ activity patterns such as payment and access and it periodically reviews if there is any change of these estimates.