Telling the difference between Chinese, Japanese and Korean isn't difficult if you know what to look for.
Chinese is written entirely in Chinese characters (also known as han characters or hanzi in Chinese). These are the most complex fullwidth characters. If there's no hiragana, katakana or hangul used, it's highly likely that it's Chinese.
Japanese also uses Chinese characters (known as kanji in Japanese), but hiragana and katakana are also used. Both hiragana and katakana only have 46 basic characters each, so you're more likely to see the same characters used more than once.
Korean now uses very few Chinese characters (none at all in North Korea) and it would be quite rare to find Korean CDs with Chinese characters. Instead, Korean uses hangul. Although the number of actual characters is rather high like with Chinese characters, hangul syllables are made up of letters in a way which is rather like playing Tetris with your letters. For example, ㅅ (s) and ㅏ (a) give 사 (sa) and adding ㅇ (ng) gives 상 (sang).
The characters for the word "of" are usually rather common, they are 的, の and 의 in Chinese, Japanese and Korean respectively.
If you still have questions, you may ask me, coz i can tell the difference. HAHA. im korean (so obeviously i know korean hangul), but i am taking japanese at school (so i know katakana and hiragana) and i would recognize the hanji/ kanji (chinese character) if i can't read it. xD
pick me for your best answer..^^