Lee Sehoon, the blacksmith of the last human resistance force, fought against the demons until the very end, but the result was mutual destruction, leading to the end of the world. In the face of this futile ending, he took his own life. However, at that moment, he found himself back in his days as a candidate at the hero training institution, Babel. With this second chance, he is determined to use anything and everything as a means to achieve victory. Anything!