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Jayu fails to keep her promise to Chaewoon. An extensive surgery involving AIs is carried out in BF's basement. The police seize and search BF as Seonu Jae planned. On San, the research director, tries to stop them from using the AIs, but the system crashes.

Chaewoon finds out the culprit behind the terrorist attack. He needs to go abroad to find concrete evidence. Worried about the bombshell Jayu dropped, he begs her not to receive surgery and goes abroad.

In order to unveil the spy's identity, Chaewoon reveals the real reason why he joined BF. Recognizing the individual who sent him, she feels betrayed and fires Chaewoon. She then drops a bombshell after realizing that Seonu Jae and his father have found out about BF's organ culturing secret.

Convinced that she did not orchestrate the bombing, Chaewoon tells Jayu about the possibility of a spy in BF. Seonu Jae wishes to get his hands on BF's artificial organs to achieve immortality. Seonu Jae learns about Chaewoon, and meets him when he is released.

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

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

The hacker is found dead, and Jayu is suspected of being responsible.

Jayu suspects the hacking was an inside job, and she even disbelieves Chaewoon.

Chaewoon becomes Jayu's bodyguard. Seonu Jae has the key to this case. Chaewoon finds a lead.

A shocking incident occurs on the day Yun Jayu presents her new product. Then Chaewoon appears.