In Japanese, Sokuon and Hatsuon are two special sounds that are written in single characters and have different pronunciations according to the environment of their location. Single characters have diverse pronunciations, which is a universal phenomenon found in Korean as well. Two final consonants that look the same can be pronounced differently according to different methods of pronunciation even under the same environment, which points to a difference between final consonants in Korean and special sounds in Japanese. In Korean, final consonants make up a single syllable, which means that the entire syllable is pronounced as a sound. In Japanese, special sounds have two-beats. Although they seem to comprise a single syllable, in entirety, they are not pronounced in a single sound. As special sounds settled down in the pronunciation environment of Japanese with an open syllable structure, they developed different pronunciation characteristics from final consonants sounds in Korean. Korean people can acquire Japanese pronunciation quite accurately, but the two languages have no complete correspondence in terms of pronunciation. Special sounds in Japanese need to be taught more accurately to Korean learners in two aspects of ‘diversity of pronunciations’ and ‘length of sound’ so that they will acquire natural pronunciations. Sokuon and Hatsuon can be acquired right through the educational methods of providing accurate knowledge and promoting repetitive training to prevent interference from the mother tongue.