In case of Android phones, you cannot download applications on to outer memory sources 

so if you do not have enough space within the device , you may face difficulties regarding download.

So although it may be tedious, we would like you to follow the steps below 

to secure enough device space and then install the game.

■ How to Secure Device Space : Delete Cache of Applications in Use 

- Application : [Settings] > Click on the app within [Application Manager] and then click on [Delete Cache]

■ Delete Unused Applications and Data 

- Delete unused applications, and data such as pictures and videos

※ There may be slight differences on how to delete cache depending on the device.