Hello,
OEM and PSM are values that you should set up whenever you execute tesseract.exe, which cannot be automatically detected under the current version. (I hope it can be improved in the next version)
I guess you are in the situation where the optimal result can be obtained through different psm values right? Unfortunately, it's a manual labor under this version.
psm 4 generally works, if your sentence is horizontally aligned, whereas psm 5 works in vertically aligned Chinese-Japanese-Korean (CJK) sentences.
I ran your bmp with psm 4 option, it worked. Although it prompted the result that you may not desire, by appending 용 된 다 at the end of the sentence. In that case, I would suggest you to retrain. It may improve accuracy. (I had a similar issue with Japanese) I hope it would help.