A bloody past haunts him. A devastating present calls him back. Nao hides from his violent past in the Japanese mob by opening a teahouse in Japan's cultural center, Kyoto. His past comes flooding back when he discovers a gravely injured man with a tattooed chest, a bloody knife, and a Korean business card. Saehyun would've died if not for Nao's help. He knows nothing of his savior's connection with the local mafia, but Saehyun has his own secrets. He commands the Korean mafia, the mortal enemy of Nao's former syndicate. As Nao and Saehyun grow closer, so does the strength of the Ko.