S1 • E1
Lee Gook Chul, heir to Soo Do Foundations, has his life turned upside down after his parents died. Blind and too young to take charge of his inheritance, he must stop his aunt and uncle from usurping what's rightfully his, and take revenge on his parents' murderers.
S1 • E2
Gook Chul and Jung Eun are exposed to a deadly virus. Gook Chul's uncle, Byun Il Jae, frames him for the death of his aunt.
S1 • E3
With Ock Chae Ryung's help, Gook Chul takes on a new identity and becomes Kang Gi Tan. Byun Il Jae finds Chairman Do's illegitimate son, Do Gun Woo.
S1 • E4
The trainees go through a series of random challenges to show their strength and weaknesses, and Oh Soo Yeon finds herself the odd one out among her peers.
S1 • E5
Soo Yeon finds the evidence proving that Oh Soon Duk faked his death. With the deadline coming, she and her peers must find Oh Soon Suk before it's too late.
S1 • E6
Gi Tan's involvement in the court case earns him the recognitions of the President and the Chairman. The top eight trainees get sent overseas for training.
S1 • E7
Michael takes a liking to Soo Yeon and asks her out on a date. Gi Tan and Gun Woo follow her.
S1 • E8
Gi Tan brings down Michael's counterfeit drug operation and is hired into the company. The Chairman learns of Gun Woo's existence.
S1 • E9
Soo Yeon gets into a fight with the Chairman's daughter without knowing who she is. Dodo Chemicals has an accident at their factory involving a carcinogenic product called T9.
S1 • E10
Gi Tan and Chae Ryung learns about Do Kwang Woo's slush funds. Meanwhile, Yoo Sung Ae is on to Gi Tan and is also investigating the slush funds matter.
S1 • E11
Gi Tan and Sung Ae form a partnership. Assemblyman Park's widow becomes Do Kwang Woo's prime suspect for the break-in.
S1 • E12
After witnessing Kang Young Duk's death and its subsequent cover up, Soo Yeon realizes that Choi Ji Hye is telling the truth. Gi Tan and Sung Ae devise a new plan to break into the secret safe.
S1 • E13
Byun Il Jae enlists Gi Tan's help to turn against Do Kwang Woo. Soo Yeon is determined to prove Choi Ji Hye's innocence.
S1 • E14
Gi Tan saves Byu Il Jae and recovers the cellphone containing the evidence. Do Kwang Woo goes on trial.
S1 • E15
Soo Yeon's testimony puts Do Kwang Woo in jail, but also puts herself in danger of losing her job. Gi Tan learns a new side to Byun Il Jae's plan.
S1 • E16
Chairman Do introduces Gun Woo as his son to his family. Byun Il Jae is alerted of a traitor, and Gi Tan falls under suspicion.
S1 • E17
The Chairman appoints Gun Woo as the new Chief Director of the FSD. Gi Tan and his people successfully launder Byun Il Jae's money before D-day.
S1 • E18
Byun Il Jae and Gi Tan are both fired from the company. Meanwhile, Gun Woo tries everything he can to hire Soo Yeon back.
S1 • E19
The plan to take down Assemblyman Hwang is in place. Byun Il Jae is once again suspecting that Gi Tan is Lee Gook Chul.
S1 • E20
Soo Yeon becomes the face of Dodo Group. Rumors that Gun Woo might be the new successor circulate.
S1 • E21
The vaccine for the mutant virus is completed and everyone fights over signing a contract with its inventor. Meanwhile, Byun Il Jae moves forward to take down Gi Tan now that the secret is out.
S1 • E22
Gi Tan gets framed from the murder of Na Do Kwang and is sentenced to prison. Soo Yeon learns that Gi Tan is Gook Chul.
S1 • E23
Sung Ae stages Gi Tan's escape from prison. Soo Yeon must steal the blueprint of the vaccine from Gun Woo, while Gun Woo deals with Kwang Woo's release from prison.
S1 • E24
Gi Tan and Sung Ae escape from Hwa Pyung Dan's grasp. Soo Yeon figures out how to steal the blueprint.
S1 • E25
Soo Yeon, Gun Woo, and Gi Tan immediately connect Dong Soo's death to Byul Il Jae. Do Kwang Woo returns to work as a low-level employee.
S1 • E26
Gi Tan slips into a coma after being shot in the head. Gun Woo is about to close the deal for the vaccine, but his open distaste for Byul Il Jae may cost him the much needed victory.
S1 • E27
Gi Tan wakes up from his coma and finds that everything has changed after a year. Soo Yeon, now an attorney, applies to Dodo Group once again, this time to be their legal advisor.
S1 • E28
Gi Tan recruits some old allies. Do Kwang Woo approaches Soo Yeon with an offer.
S1 • E29
Gi Tan continues his attempts to thwart Byun Il Jae's campaign. President Do and Gi Tan are reunited.
S1 • E30
Kwang Woo tries to befriend K. Gi Tan tells Moon Tae Kwang his plan for Dodo Group.
S1 • E31
Il Jae turns the attack on Ji Soo to his advantage. After Gi Tan is put in the middle of the Do siblings' fight, Shin Young decides to seduce him.
S1 • E32
Chae Ryung offers Il Jae a strategy to avoid needing Jae Man's help. Gi Tan finally agrees to go out with Shin Young.
S1 • E33
Professor Jin returns to rehypnotize Gi Tan. President Do is determined to win over Soo Yeon to spite Gun Woo. Candidate Jo Cham dropps out of the race for mayor and gives Byun Il Jae his endorsement.
S1 • E34
Byun Il Jae tries to rid himself of Attorney Oh Soo Yeon. Chairman Do finds out why he has been getting sicker.
S1 • E35
Byun Il Jae reaches out to his father-in-law for help. When his father-in-law refuses to help him, Byun Il Jae finds a way to keep his enemies occupied.
S1 • E36
Byun Il Jae tries to turn the tables on Soo Yeon in court. Ock Chae Ryung struggles to escape.
S1 • E37
Ock Chae Ryung has a chance to testify in court. A surprise witness, who has evidence of the bribe, lands Byun Il Jae in jail. Kang Gi Tan and Do Gun Woo prepare to go head to head at the shareholders meeting.
S1 • E38
As the shareholders meeting approaches, tensions mount. Chairman Do continues to show signs of mental instablitiy.
S1 • E39
Chairman Do struggles mentally while Do Gun Woo tries to save the company through financial restructuring. The battle for Oh Soo Yeon's heart is full-fledged and even violent.
S1 • E40
Hwang Jae Man asks Byun Il Jae to sign divorce papers to ensure that his presidential campaign runs smoothly. Gi Tan is determined to find out who Oh Soo Yeon was to him.
S1 • E41
Gi Tan offers to help Hwang Jae Man with his presidential campaign. Chaiman Do continues to show signs of Alzheimer's.
S1 • E42
Gi Tan and Gun Woo gather all the creditors to vote on stock values of Dodo Pharmaceutical. Chairman So is instrumental to determining who prevails. Oh Soo Yeon fields love from both sides.
S1 • E43
Chairman Do's medical diagnosis is unveiled after previously being kept secret. This shakes up all of the family members' individual plans of getting their hands on his will.
S1 • E44
Chairman Do decides to move forward with surgery. Do Gun Woo works on a plan to bring down Dodo Hotel.
S1 • E45
Everyone is searching for Pandora's box and the race is on to see who can sneak Chairman Do out of the hospital first.
S1 • E46
Gi Tan convinces Soo Yeon to run a handwriting analysis on Chairman Do's will. Do Gun Woo agrees to trade Pandora's box for his father's location.
S1 • E47
Soo Yeon finds out what Do Gun Woo is really up to. Ock Chae Ryung swoops in to pull the rug out from under Do Gun Woo.
S1 • E48
Everyone is shocked at the appearance of Chairman Do, who has asked Soo Yeon to say that she's been taking care of him this whole time. Do Gun Woo begs for Soo Yeon's forgiveness.
S1 • E49
Everyone is on the edge of their seats as they wait for the election results to come in. Gi Tan moves forward with his plan.
S1 • E50
In the series finale, secrets are finally brought to light and everyone must deal with the consequences.
Kang Gi-tan
Oh Soo-yeon
Do Geon-woo
Yoo Seong-ae
Byeon Il-jae
Do-choong
Hwang Jae-man
Do Gwang-woo
Do Sin-yeong
Hwang Ji-soo