When Seoul-dialect speakers attempt to learn the Japanese language, " end focus " affects syntactic structure, information structure, and speech discourse. " End focus " is identified by pitch changes and segmental lengthening at the end of the Perceptual Sense Unit(PSU). Ten Seoul- dialect speakers were chosen for the research on speech discourse. The results showed that " end focus " is classified as, the grammatical form at the end of postposition in the speech discourse. Mostly " end focus " is identified as meaning of reason postposition I te(de) i meaning of adversative conjunction I keredomo i meaning of order postposition I te(de) meaning of reason postposition I node,kara i and meaning of theme postposition I wa i . Also, " end focus " has two discourse functions they are, one, a speech continuance marker, and two, an emphatic marker in the speech discourse.