At the time, Finance Ministry officials cited the bill’s design as a key issue behind the postponement. On the bill’s front, Kim Gu, a Korean independence fighter under Japan’s colonial rule in the early 1900s, was to be featured. The back was supposed to depict the “Daedongyeojido” - a wood-engraved map of the Korean Peninsula created by Kim Jeong-ho, a geographer and cartographer during the Joseon Dynasty. But controversy emerged after it was revealed that Kim’s engraving did not include Dokdo, a controversial group of Korean islets in the East Sea, which Japan claims as its own territory. Public sentiment would have the BOK add Dokdo, but doing so would compromise the integrity of the original work.Finally, "integrity" wins out over "public sentiment," for now.
HERE is another article on the topic from the AFP.