Lee Hyun Woo seeks revenge against the people who had killed his biological father, Lee Kyung Ho. Even if he had lost his memories as a child at the time he was in Japan, he had not lost his will to seek justice and put the men behind his father's death and his accident behind bars. Watari Ryota, a secret agent and Hyun Woo's private investigator would do his best to help Hyun Woo but at the same time, hopes to become friends again with the man who was once his best friend in Japan. Jang Anna, a Japanese-Korean violinist who loves Hyun Woo, even after the divorce would do her best to support Hyun Woo even if he kept making her stay away from him. Will they all be able to stay together and find out the truth about why Lee Kyung Ho had to pass away? What other secrets does the Lee Family hide?