Japan and Korea's biggest names star in this big-scale drama. Nishijima Sho is a Japanese detective whose father was murdered in Korea when he was still a boy. In hopes of discovering the truth behind his father's death, Sho is working undercover in a huge secret organization. Choi Yuna is a Korean woman who visits Japan in search of her missing father. She opens a Korean restaurant with her younger sister, but soon faces the mercy of fate. The couple meets in a corner of Tokyo and fall in love. But what waits ahead of them. A "rondo" of fate, love, and history is about to begin.