Thanks for answer. I DID change language in options. But it didn't do anything. Still korean menu and black screen after start, only thing that works is "G" key which shows a Google imitation, probably something as a "boss key" feature.The option menu should be the fifth from the top, you can switch language to english by tapping the second bar from top to the right.
I ran the game without locale emulator, maybe try that?
As a sidenote, you can stop the time from progressing by opening the option menu. Useful if you want to pick between options, but time will advance and resume like usual after you picked a choice. Tried entering the time as 4 digit (1500) and separating it by hours and minutes (15 and 00) on cheatengine but didn't manage to find the address, what value type was used for this? Having to open option menu each time you entered a choice just to pause the timer is really annoying.