Park Y/N works as a Secret agent along with his girlfriend Yura and his friend Henry Park. they are sent to a deadly mission which many agent tried but failed. Yura has been kidnapped and y/n save her but he didn't know that his friend Henry and Yura betrayed him. he was left in darkness and can't move then after he died, he became a shadow finding vengeance and one girl found his identity then he decided to keep an eye on her movements.