I have a Sharp Super Scientific EL-9000 calculator (that used to be my mom's back in the day) which came with a Korean manual. I am a Korean American, and I can't understand the manual well. Does anybody have access to an English one? The format doesn't matter.
You might want to look for EL-5200 (not EL-5200X - which is related but different - like the whole 9x00 series) as well, as that's (AFAIK) the very same model. A quick search revealed a page with some handling information maybe good for first steps (and cross referencing to your Korean manual).
In addition, here's a French manual and the service manual for the printer/cassette interface CE-50P - quite helpful if you want to hack some interface to modern devices. Heck, there's even a book describing it's use for statistics.