“Can the Earth that's been devastated by the sudden appearance of monsters, find peace once again?" One day, an unknown virus spreads, and mutants appear all over the nation, attacking people. Yeo Hwarang, who had been living a peaceful life until that day, loses his mother to a mutant. The shock of that loss causes him to awaken as a mutant himself... After becoming a mutant, he decides to live to punish the mutants who killed his mother. However… The mutants, who were thought to be unintelligent monsters, begin to show wicked intentions of wanting to dominate over the humans… Will Yeo Hwarang be able to stop the mutants and restore the peace for humankind?