Chaewoon becomes Jayu's bodyguard. They attempt to fix the hacking but realize governmental power is needed. Jayu asks Seonu Jae, the prime minister, for help. A BF chief researcher gets in a car accident. Jayu suspects these incidents are related, and Chaewoon finds something suspicious about the hacking.

It is suspected that the hacking could have been an inside job. Could the culprit be nearby? Ja Yu digs into Chae Woon's past. She finds out that he was present alongside her during the terrorist attack that involved the president a few years ago.

Seon U Geun, the chairman of DORSON Group and Seon U Jae's biological father, suggests that Ja Yu sells her cultured meat technology to him. Meanwhile, the hacker is found dead. Ja Yu is suspected of being responsible and she even receives death threats.

In a life-and-death situation, Chaewoon is moved to a hidden laboratory in BF's basement.

Just when Chaewoon thinks he found a lead, he faces with an even bigger tragedy.

The police suspect Chaewoon and arrest him. Seonu Jae takes interest in Chaewoon.

In order to unveil the spy's identity, Chaewoon reveals the real reason why he joined BF.