This is the initial game control setting selection (the in-game options allows for more granular setup of keybinds for movement, interaction, menus) where you can select which mouse button you want the movement/combat on.
공격 - attack , 이동 - movement (CBT1, the default movement and attack setting was MOBA style with movement on right mouse button which messed with some ARPG players memory muscle).
The default bindings for other skills, NPC interaction, and dash mobility shown below the two base options.
![](https://i.ytimg.com/vi/Hwuc8hjpbx4/maxresdefault.jpg)