故事讲述成为了罪犯的哥哥葛城勇吾以及成为了警视厅搜查一课刑警的弟弟圭吾。弟弟因在杀人未遂事件中被测出了与嫌疑人的DNA跟自己完全一样而遭到逮捕。此时他想起了在20年前因被诱拐而下落不明的双胞胎哥哥。

劇情描述雙胞胎兄弟在10歲時哥哥被誘拐，經過20年後弟弟為查明真相已成為刑警，兄弟的父親上節目求助於觀眾，但讓提供線索的男性被傷害，在犯罪現場遺留的毛髮經DNA比對與圭吾雷同，證據顯示哥哥還活著…。

Keigo and Yugo play together in a park near their home. Their face look exactly the same, but they are called “Mirror Twins” because Keigo is a right-hander, whilst Yugo is a left-hander, and they have different personalities. At sunset, Keigo offers Yugo to come home together, but Yugo says “No.” Yugo doesn’t want to go home as he feels uncomfortable there, as he is always compared to Keigo who’s a good example to everyone. Finally, Keigo leaves Yugo at the park, and this is the last time for Yugo to see him. Soon after, Yugo is kidnapped and his family is demanded a ransom. Unfortunately, the kidnappers rob the ransom and disappear without releasing Yugo. Keigo feels a deep sense of remorse for what he did at the park. 20 years later, Keigo works hard as a detective to make up for his mistake, until an incident comes up suddenly. It starts from a live TV show, which sets out to search for missing people. Eiichi and Harue ask the viewers for information about Yugo, however, right after that, Eiichi dies in an accident. Meanwhile, Tajima, who gives himself up to the show with information about Yugo is assaulted by someone and goes into a coma, and Keigo is eventually appointed to be in charge of these cases. When Tajima recovers consciousness, he finds Keigo and shouts “He is the one who assaulted me!” At the same time, Keigo’s gene information is found at the scene of the incident…This makes Keigo to feel certain that Yugo is still alive and begins his revenge.

葛城圭吾（藤ヶ谷太輔）は警視庁捜査一課の刑事。圭吾の双子の兄・勇吾は20年前、何者かに誘拐され、いまだ行方が分からなかった。ある日、圭吾は殺人未遂の現場に遭遇する。圭吾の父・栄一（佐戸井けん太）がテレビ番組で勇吾誘拐事件に関する有力情報に1億円の私的懸賞金を払うと言った矢先のことで、刺された田島（濱津隆之）は、勇吾の事件について何か知っているようだった。　犯行現場で見つかった毛髪のDNAが圭吾のものと一致したため、圭吾が容疑者として追われる身に。圭吾はDNAが同じなのは勇吾しかいないだけに、兄の生存を確信する。確かに勇吾（藤ヶ谷・2役）は生きていた。誘拐犯だけでなく連れ去られるのを目撃しながら恐怖に駆られ逃げ去った圭吾までも憎み、復讐心だけを糧に成長していたのだ。

동일한 DNA를 가지고 있으면서도 어린 시절 납치 사건으로 생이별하게 되면서 전혀 다른 길을 걷게 된 쌍둥이의 이야기를 그린 드라마

Uma tentativa de assassinato ocorre. O detetive Katsuragi Keigo investiga o caso. A única evidência encontrada na cena do crime é o mesmo DNA do detetive Keigo. Ele acredita que o criminoso na tentativa de assassinato pode ser seu irmão gêmeo mais velho, Yugo. Em uma idade jovem, Yugo foi sequestrado.