When BF launches its new product, the public applauds CEO Jayu. However, the product's success damages the agricultural sector. A farmer "attacks" Jayu's vehicle and BF's laboratory is attacked.

Chaewoon becomes the full-time bodyguard of Jayu, the CEO of BF. Jayu struggles with the ransomware and asks Chaewoon for advice, counting on his experience. The two want to catch the culprit, but realise they need help from the government.

Suspicion arises that the hacking may have been an inside job. Jayu digs into Chaewoon's past and discovers that he witnessed the terrorist attack on the president a few years ago.

Jayu receives an unexpected offer when Geun Seonu, CEO of the DORSON Group and Jae Seonu's biological father, proposes that Jayu sell her breeding-flesh technology to him. Chaewoon discovers where the hacker is hiding.

When Chaewoon is left in a critical condition, she is taken to a hidden lab in BF's basement.

Just when Chaewoon thinks he has discovered a clue, he faces an even greater tragedy.