It replaced Glamorous Temptation and airs on MBC on Mondays and Tuesdays at 09:55pm (KST) from March 28 to September 20, 2016 for 50 episodes.

In his youth, Lee Guk-cheol lost his wealthy family as well as his sights due to the orchestrated car accident and his inheritance to his greedy uncle, Byun Il-jae who plans to steal the inheritance to invest in his scheme to buy out Dodo Group, a powerful conglomerate.

Guk-cheol's aunt Moon attempts to expose her husband in revenge for his infidelity was killed by Il-jae's mistress who is also her best friend.

He lost everything and descended to the lowest echelons of society, from spoiled rich heir to lowly beggar almost overnight.

However, with the help of Yoo Seong-aean, an NIS agent who investigate the Dodo Group, opportunity arises whereby he is able to obtain a new identity - Kang Gi-tan, allowing him to take back what is rightfully his and enact vengeance on those responsible for ruining his life.

However, in his quest for revenge, he meets opposition in the form of Do Gun-woo, the illegitimate son of a chaebol chairman, and Oh Soo-yeon, a young woman who seem suspiciously similar to someone he developed feelings for in his youth.

As Guk-cheol climbing the corporate ladder, he teams up with Do Choong to take down Il-jae by exposing his entire scheme to the Chairman.

Blinded by the car accident that killed his parents, Guk-cheol's sense of hearing is heightened to superhuman levels, an ability he would continue to possess as an adult.

With the latter's financial backing, Ki-tan starts his own company, KT Corporation, with plans to take over Dodo Group and complete his revenge.

She is somewhat materialistic, stemming from her struggles to make ends meet to pay for her autistic younger brother's medical fees.

Gun-woo lived in America for most of his youth, having murdered his abusive stepfather and witnessed his mother commit suicide.

Byun Il-jae brings him back to Korea with the intention of using him as a tool to topple Dodo Group's chairman and take the company for himself.

Il-jae was Guk-cheol's uncle who murdered his parents and stole his inheritance so he can invest in his scheme to buy out Dodo Group.

He is a greedy and power-hungry man who schemes to take control of Dodo Group and eventually rise to a position of eminence.

Gwi-ja becomes increasingly angry when Do Choong allows Gun-woo's rise to power in Dodo Group after Gwang-woo's imprisonment.

Gwang-woo is an extremely greedy and unscrupulous man, having blackmailed Il-jae into murdering Guk-cheol's parents.

Gwang-woo was later found guilty of creating a slush fund and for allowing T9, a carcinogenic coating agent in Dodo Group's products.

A hardworking employee who dedicated his life to Dodo Group, he is fired by Gwang-woo for hurting the latter's pride.

After struggling with poverty for a year, Ki-tan recruits him to join his company, KT Corporation, which Tae-gwang accepts.

It is later revealed that she is actually a lobbyist working for a secret organization which plans to obtain the vaccine for MK2, a lethal mutant virus.

Jeong-eun's younger brother, who suffers from Lennox–Gastaut syndrome, thus requiring her to work hard to pay his medical fees.

Jeong-eun and Dong-soo's father, who worked as the head of security at Sudo Hospital when Guk-cheol was a teenager.

A wealthy Chinese businessman who was involved in the manufacture and distribution of counterfeit drugs, which affected Dodo Group.