I strongly recommend to use 2.2.x. 2.2.x contains serialized data format changes. You need to convert serialized data from 2.1.x and 2.0.x to 2.2.x.
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JPY, KRW, TWD, IDR and other integer currencies are same. It's caused by 2.2 version of Magento framework. To fix this issue, you need to rewrite Magento\Framework\Locale\Format::getPriceFormat().
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Perhaps, you have to find Magento solution partner in Korea. I don't know which company is the best in your country, but maybe someone will assist you. This issue is not only your country, but also most of Asian countries.
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It's not only font file. Printing some characters that consist of both single-byte and double-bytes, we have to calcluate each words width correctly. Otherwise they are sticking out from rectangle area! And also Zend_Pdf can't generate PDF files without font file. So multibyte PDF (especially Chinese and Japanese) becomes huge size.
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