Monster

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.

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.

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.

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.

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.

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.

Michael takes a liking to Soo Yeon and asks her out on a date. Gi Tan and Gun Woo follow her.

Gi Tan brings down Michael's counterfeit drug operation and is hired into the company. The Chairman learns of Gun Woo's existence.

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.

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.

Gi Tan and Sung Ae form a partnership. Assemblyman Park's widow becomes Do Kwang Woo's prime suspect for the break-in.

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.

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.

Gi Tan saves Byu Il Jae and recovers the cellphone containing the evidence. Do Kwang Woo goes on trial.

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.

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.

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.

Byun Il Jae and Gi Tan are both fired from the company. Meanwhile, Gun Woo tries everything he can to hire Soo Yeon back.

The plan to take down Assemblyman Hwang is in place. Byun Il Jae is once again suspecting that Gi Tan is Lee Gook Chul.

Soo Yeon becomes the face of Dodo Group. Rumors that Gun Woo might be the new successor circulate.

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.

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.

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.

Gi Tan and Sung Ae escape from Hwa Pyung Dan's grasp. Soo Yeon figures out how to steal the blueprint.