Yuri, Luna, Heechul and Hankyung are young mutants. They live in the Xavier Institute where they are taught how to control their powers. The humans don’t know about the mutants living among them, but when they find out, the entire USA is flooded with anti-mutant protests. Once that happens, Magneto and the Brotherhood of Mutants start a war against the humans. It’s up to X-Men to stop them and to prove to humans that they are not dangerous. While the rest of the world is finding out about humans, X-Men start recruiting more mutants.