Hoegwijaga Da Mandeureojum

A blacksmith named Lee Saehoon was part of the final alliance resisting demonic forces, but the conflict ended in total annihilation. After taking his own life in despair over the outcome, he awakens back to his time as a trainee at Babel Academy, a hero training school. Given a second opportunity, he resolves to use every possible resource to secure a different, victorious outcome.