Unexpected

It is Christmas Eve of 2025. BF showcases their new product. Everyone praises Jayu, the CEO, but the primary industry suffers because of BF. Two other incidents occur on the same day. A stockbreeder falls on Jayu's vehicle. BF Laboratory is subjected to a ransomware attack. Chaewoon is involved in both incidents. Who is he?

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? Jayu digs into Chaewoon's past. She finds out that he was present alongside her during the terrorist attack that involved the president a few years ago.

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

Chaewoon is critically injured during the shoot-out. The secret laboratory in BF's basement begins the operation. Chaewoon recovers swiftly, but there seems to be something wrong with his hearing. Could this be a side effect of recovering so quickly?

The hacker's body is found. Jayu does not understand why he attacked her and her company. Chaewoon and Hoseung, a fellow bodyguard, retraces the hacker's steps. They find an individual who was close to him, but something strange happens when they try to meet this individual. Then a tragedy befalls.

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.

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.

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.

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.