We seem to have language issue in Korea.
when using Korean as keyboard input in Windows, the game is freezes and can't reach to the main menu. (have to force quit)
but if we change keyboard input into something else (Japanese, English) then it normally boots and has no problem even if I change the language settings
This new glitch was found after the most recent patch at 20th of June.
We did found a way to detour it, but newly bought people might just refund it away if this is not resolved.