A headless corpse whose death was caused by a strange cause involved a complicated overt and covert struggle between two major rivers and lakes; a knight-errant who never showed his true face had an unexpected tragic experience hidden under his human skin mask; a prisoner who surrendered himself committed suicide in prison for no reason. However, the real culprit was someone else; when the evidence came closer to the truth step by step, the Director of Prisons ordered the investigation to be stopped and the case was closed... Everything happened unexpectedly. What is terrible is often not the conspiracy itself, but the twisted psychology behind the conspiracy. When the hateful facts that are most unwilling to be admitted surface, the choice between loyalty and righteousness is like a huge gamble, and only time can tell what is right and wrong.