mysterious Korean man known as "Amur Tigro", one of the pillars of the dangerous underworld organization CASTEL, The leader of the BAEK-UI organization, a former member of the underworld assassination organization in Russia. Kim Shin has never known love since his father died when he was a teenager. But after meeting you, the daughter of his friend, he started to feel something growing in his heart. despite the fact that he was the one responsible for your father's death.