Eubadura yooi Lee and Ahn, new species is described from the Korean coasts. The validity of the new species is supported by the external form and the internal structure of the male genitalia, as well as partial COI gene sequences. We also discuss the systematic status of Eubadura and report Eubadura hokkaidensis Tasaku and Maruyama for the first time in Kamchatka, Russia. An updated key, description, and illustrations of diagnostic characters are provided to facilitate identification.