Hidden Dragon in the City: I Was Made Difficult When Delivering Food at the Beginning

In a near-future city where thermal weapons are strictly controlled and extraordinary ancient martial arts are quietly resurrected, a reclusive master who delivers food to hide his identity is forced to tear up his oath of "never showing force" in order to investigate the truth about his sister's mysterious coma. Like a sword that has been silent for thousands of years, it pierces the seemingly impregnable steel jungle built by the chaebol and the ancient martial arts family.