After finding out who the president is, Jung Woo attempts to find the location of the secret lab by using Oh Jung Hwan as bait. Hyun Hee realizes that something is off and tries to lure in Jung Woo. With only few seconds left before the bomb goes off, Jung Woo has to make a decision whether to leave his mother to die or to save her. The last battle against White Night Foundation begins.

Jung Woo tells Jamie that he has finally met Hyun Hee who is known to be Jung Woo and Jamie’s mother. After hearing that, Jamie seems to feel down. Meanwhile, Hye Won asks her father about the location of the secret lab again, but he refuses to share it. Hye Won tells her father that she has seen the formula known to have been erased by Jung Woo.

Hye Won gets abducted and held hostage. Jung Woo finally finds the secret lab and goes inside. But there’s someone who’s watching him in the building. Meanwhile, Jae Woong tells Yong Shik who the next target is. Yong Shik makes a call to somebody to make him prepared for Jae Woong’s attack.

Jamie realizes that Jung Woo is her twin brother, the so-called monster who saved her life. After saving Jamie, Jung Woo continues with the investigation to find the location of the secret lab. Meanwhile, Hye Won persuades her dad to step away from the unethical experiment. However, Il Do chooses his life’s work over his daughter.

Jamie finally arrives at the very place she abhors to even stay for a second. At the White Night Village, she and Ji Wook search for clues that might trigger Jamie’s lost memories. Meanwhile, Jung Woo is able to secure Oh Jung Hwan’s son. Later that night, when Jamie and Ji Wook find themselves isolated at the village, a group of gang ambushes them. Standing in front of Jamie when she recovers from unconsciousness are Jung Woo and Jae Woong.

Hye Won manages to save Jung Woo from the attack and car accident. They soon find out that one of their colleagues has betrayed them. Meanwhile, Jamie sets off for White Night Village with Ji Wook to recollect her memories of what happened in the village. But then, a new warning arrives at Ji Wook’s office.

Jung Woo witnesses that a group of children is forced to get in a black van in front of Seoul Hangang Welfare Center and taken to somewhere, and he starts to follow the van. At the same time, Hye Won, who’s suspicious of his father, keeps tailing him. Meanwhile, Lee Tae Soo jumps off his office building when Jamie and her colleagues visit there.

Jung Woo continues to search for the secret lab. He runs into kids at an orphanage who talk about several kids being adopted by new families at the same time. Jung Woo thinks there’s something fishy going on in that facility. Meanwhile, Jamie happens to see a man who seems to have collapsed on the street. Without knowing his identity, she takes him to the police station.