After ten years of service, rescue worker Soohyuk Kim dies while on duty. But just when everything appears to be over, Soohyuk finds himself returned to his rookie days! He also possesses new tools, ranging from mysterious pop-up windows to special abilities and even memories of his past life! And after a selfless act makes him a local hero, Soohyuk is determined to improve. This time, he intends to rescue everyone... especially those he failed to save before.