You can link your account to save and use the same game data on multiple platforms.
Link/unlink your account by going to Game Menu (ESC) > Options > Account > Link Account.
If you do not have game data in your Nexon account,
the game data of the platform you are currently on will be bound to your Nexon account when you link your account.
This allows you to play on any platform with the game data you want
by selecting the Primary Account from the multiple sets of platform game data linked to your Nexon ID.