chinese grammer is not similar to Japnese but Japanese is written using Chinese characters, and has historically imported many words of Chinese origin. Korean's grammatical structure is most similar to Japanese, however. It is certainly not related to Chinese, although it has borrowed many Chinese words and has used the Chinese characters, together with the Korean alphabet, for many centuries. The Korean alphabet (Hangul script), invented in the years 1443-46, is the only true alphabet native to the Far East. Modern Standard Korean is based on a dialect spoken in Seoul. Korean grammar has a system of honorifics-endings and internal word markings that reflect established social relationships.

no, it's simpler

در قديم، زبان چينی بر زبان ژاپنی و کره ای تأثيرات بسيار گذاشت، اين روابط مانند روابط زبان عربی و فارسی می باشد که از لحاظ کلمات، تلفظ و موضعات فرهنگی می توان شباهت زيادی پيدا کرد بين زبان چينی، ژاپنی و کره ای. ولی از لحاظ زبان شناسی، دستور زبان چينی با زبان ژاپنی و کره ای شباهتی ندارد، چون آنها عضو سيستم زبان متفاوتند.

Chinese, Vietnamese : Isolating language, see http://en.wikipedia.org/wiki/Isolating_language Korean, Japanese: Agglutinative language, see http://en.wikipedia.org/wiki/Agglutinative_language

Thanks so much dear Deofol!;)