劉強赫與劉信赫是雙胞胎。小時候，哥哥強赫偷偷地跟著父親去查案時遇上交通意外，強赫的父親喪生而他卻失去了記憶，被人帶到徐恩河的家領養，改名叫徐河恩。不久，弟弟信赫的母親帶著他改嫁。

20年後，河恩當上了警察，與青梅竹馬的恩河發展成情侶；而弟弟劉信赫當上了大企業的社長，正籌備與李康珠訂婚。某一日，首爾發生一件看似是自殺的案件，但河恩覺得這並不簡單，正當河恩與前輩慶基道深入調查時，他的前輩發現這件案件與20年前，基道的前輩亦即是河恩的父親的死有關……

徐河银是一个比谁都认真生活着的年轻人，虽然有不幸的过去，可是用积极的心态比谁都认真的，诚实的活 着，他相信不管世界有多少谎言和邪恶，只有真实是力量和希望，等着他的是残酷的现实。

为了权利，为了富贵，为了贪婪的爱情，而破坏一个家庭的幸福的人们，他们现在还在喊着正义享受荣华富贵，这样还能相信真实是希望，世界是公平的。

但是他只是想压住报仇和憎恨，他比谁都清楚报仇是另一个恶、憎恨最终只会毁了自己，虽然心里很痛苦，但是还是想原谅他们，可是他们为了掩饰自己的邪恶，制造出另一个邪恶，把唯一的弟弟逼到死亡，20年来见面的他唯一的弟弟，他的亲人。

现在他的心已经被复仇燃烧了，幸福的人生一瞬间变成恶梦的他，现在放弃自己对善和恶的判断和信念，代替的是像地狱一样的复仇心。

正好他遇到绝佳的机会，自己已经死了，是个死人了，他把自己写在死亡证明书上，然后复活为另一个人开始残酷的复仇，可是为了复仇的复活要以他深爱的恋人离别为代价，深爱的女人在面前也要装不认识，只能希望她成为别人的女人，这样悲痛的爱情难道是上帝对他的惩罚

Yoo Qiang Hyuk en Yoo Shin Hyuk zijn een tweeling. Toen hij nog een kind was, was zijn broer Qiang Hyuk betrokken bij een verkeersongeval terwijl hij in het geheim zijn vader volgde om een ​​zaak te onderzoeken. De vader van Qiang Hyuk stierf en hij verloor zijn geheugen. Hij werd ter adoptie naar het huis van Seo Eun Ha gebracht en werd omgedoopt tot Seo Ha Eun. Al snel nam de moeder van zijn broer Xinhe hem mee om te hertrouwen.

Twintig jaar later werd Ha Eun politieagent en werd hij een stel met zijn jeugdliefde Eun Ha, terwijl zijn jongere broer Liu Xin Hyuk president werd van een groot bedrijf en zich voorbereidde op zijn verloving met Lee Kang Joo. Op een dag deed zich een schijnbaar zelfmoordzaak voor in Seoul, maar Ha Eun vond dat het niet eenvoudig was. Toen Ha Eun en zijn senior Kyung Gi Do een diepgaand onderzoek deden, ontdekte zijn senior dat deze zaak twintig jaar geleden verband hield met Gi Do. De oudste van Ha Eun houdt ook verband met de dood van Ha Eun's vader...

Yu Gang Hyuk was only 7 years old when his father was murdered in a car "accident" and separated from his identical twin, Yu Shin Hyuk. He forgot his name and family and given the name Suh Ha Eun by his adopted father Suh Jae Soo. He falls in love with his adopted sister, Eun Ha and tried to be very honorable about it. He was led to become a cop because of his father's badge. While investigating an alleged case of suicide, he eventually learns of his twin brother. Against the warnings of his peers, Ha Eun becomes more and more involved in this suspicious case. As a part of a larger scheme, Ha Eun is targeted for a hit by unknown individuals. And when Ha Eun and Shin Hyuk finally meet for the first time in twenty years, the murderers kill Shin Hyuk accidentally mistaken him for Ha Eun. As a result, Ha Eun vows to get revenge by giving his enemies psychological torture and takes on his brother's persona as an undercover cop and that is where the drama begins.

역대 복수극 드라마중 가장 우수한 각본과 탄탄한 스토리를 자랑하는 웰메이드 복수극. 신인이자 무명에 가까웠던 엄태웅을 단숨에 스타덤에 앉힌 작품이다. 동시에 후술할 수많은 거물급 배우들의 발판이 된 작품이기도 하며 현재의 드라마들과는 비교를 불허하는 퀄리티를 자랑하는 드라마다. 쌍둥이로 태어난 주인공 유강혁, 유신혁 형제 중 유강혁이 아버지의 사고(를 가장한 살해)에 휘말려 생이별해 떨어져 살게된다. 이후 유강혁은 이복 여동생인 서은하와 함께 살다가 여동생 은하가 자신을 남자로써 사랑한다는것을 알고 그녀의 마음을 받아들인다. 그러나 행복한 사랑도 잠시, 열심히 조사하고 찾아다닌 끝에 겨우 다시 만난 동생 유신혁이 또다시 억울한 죽음을 당한다. 이에 강혁은 자신의 아버지와 동생을 모두 죽은 잔인한 놈들을 처단하기 위해 자신이 쌍둥이라는 점을 이용해 동생 신혁으로 위장해 살아가며, 동생과 아버지의 처절한 복수를 한다는 것이 주요 내용