Labiodentalization occurred in Late Middle Chinese, Tang(唐)dynasty. There are many occupations on the origin of Sino-Korean after advocated Sino-Korean originated in Late Middle Chinese by Kono Rokuro(1968). Sino-Japanese Go’on(吳音) was originated in Early Middle Chinese, and Sino-Japanese Kan’on(漢音) was originated in Late Middle Chinese. because, there are no reflects of labiodentalization in Sino-Japanese Go’on and there are reflects of labiodentalization in Sino-Japanese Kan’on. In this research, search out reflects of labiodentalization of Sino-Korean compared with Sino-Japanese Go’on and Kan’on. In conclusion, 1)there are no reflects of labiodentalization in Sino-Japanese Go’on. 2)there are reflects of labiodentalization in Sino-Japanese Kan’on. It was reflected in the kana notation of Yang(陽) rhyme, Yuan(元) rhyme, Zhong(鍾) rhyme, Dong(東) rhyme, You(尤) rhyme, Fan(凡) rhyme. 3)there are no reflects of labiodentalization in Sino-Korean without the shape of -an/l in Yuan(元) rhyme & the shape of -ïn/l in Wen(文.) rhyme. Consequently, I advocate Sino-Korean was not originated in Late Middle Chinese, and there is possibility originated in Early Middle Chinese as a Sino-Japanese Go’on.