A mysterious korean man, Kim Shin is a legend in Russia. He is the top hitman in the country, known as Amur Tigro by those who live there. After one last mission, he has decided to go back to Korea and settle his score with Castle, the supreme criminal conglomerate that governs the entirety of the Korean underworld. With a past closely tied to Castle's own and a plan, built and prepared for through many years, Shin is finally ready to take down Castle, building his own forces along the way.