"Koreanosaurus" is a nomen nudum, or naked name, meaning it has never been enrobed in an official description (that's why it's enclosed in "quotes"), and may be the same as "Koreasaurus" which is equally as nomen nudy, because it's only mention was in an A-Z in David Lambert's Ultimate Dinosaur Book on page 192. It's based on a partial femur (DGBU-78) from South Korea's Lower Gugyedong Formation that was mentioned way back in 1973 by Haang Mook Kim. Then it went downhill fast, which shouldn't be surprising in hindsight; *cough* Ultrasaurus *cough*. In 1979, Kim assigned "Koreanosaurus" to Deinodontidae, which had already been replaced by Tyrannosauridae nine years before that, then he moved it to Hypsilophodontidae in 1983. But by 1993, he had conceided that it was probably a species of Deinonychus which he named "Deinonychus" koreanensis. Yuong-Nam Lee reinstated "Koreanosaurus" by removing it from Deinonychus in 2001, then Kim got involved again in 2005 and assigned it to Maniraptora, using its crest-shaped fourth trochanter (a nubbin of bone that anchors thigh muscles) to suggest a kinship with Velociraptor and Adasaurus which are both dromaeosaurids. It's one of the great mysteries how this fossil managed to make it through at least five different scientific papers and still emerge minus a description even remotely worthy of adding its name to the roll call of dinosaurs. But that ship has sailed. "Koreanosaurus" is now officially occupied by Koreanosaurus boseongensis, so if Kim ever gets 'round to describing his bone he'll have to call it something else, and our money is on Korearaptor.