Synopsis: The son of a wealthy family and the eldest of the twin brothers Yugo was kidnapped. 20 years later, Yugo’s younger brother, Keigo, works as a detective in the First Investigation Department. Although Yugo’s case is discontinued, it is still not disclosed and his whereabouts are unknown, not to mention whether he is still alive. While investigating an attempted murder case, Keigo finds the suspect’s DNA coincide with his own. He believes that the criminal may be his twin brother Yugo.