The war ended with the defeat of the villains. Now the world is ruled by corrupt heroes. And one of those heroes killed Yihwa's unni. She doesn't know which one, but that doesn't matter. If she kills them one by one, they will be among them. Yihwa becomes the Hero Killer, a villain who hunts heroes every night. This one villain's vicious action fight. "I'll kill everyone, and take everything away!"