One day, the artificial intelligence G.A.B arrives at 'Mukgureum(dark cloud) Security.' During a meeting, Ms. Park, the team manager of the 'Everything Except Marketing, Planning, Development, and Sales Team,' makes a bold(?) remark and is assigned to take charge of G.A.B. Ms. Park's task is to nurture G.A.B into a world-renowned security artificial intelligence. Although G.A.B appears intelligent, it has zero knowledge of security. Could it truly evolve into a security-savvy artificial intelligence?

G.A.B officially becomes a member of 'Mukgureum Security.' However, the joy is short-lived as G.A.B is dispatched as the cybersecurity specialist of a trading company. Has the smooth-sailing office life come to an end? G.A.B's struggle to upgrade the employees' security knowledge begins.

In the meantime G.A.B has gone through a lot of experiences, G.A.B is still a cold-hearted robot with almost zero social skills. The exceptional measure given to G.A.B. is to survive in a high school full of chaotic and energetic youth. It seemed like G.A.B. would lead an uneventful life after making new friends 'Inbyul'(an influencer on social media) and ‘Deoku’(security geek)... However, G.A.B is tirelessly busy dealing with attacks targeting students such as malware, Zoom-bombing, malicious apps, and sextortion. Could G.A.B really develop social skills in this place?

As part of the business project to make a profit from G.A.B, G.A.B goes to a new school. Although it's also a school, it feels quite different from the high school from the last season. Among the students with distinct characters at the 'Silver Restart Institute', G.A.B can't seem to pull itself together. Various security threats targeting the elderly, such as voice phishing, smishing, and fake news, and the students who eagerly take the bait with all their might!
Why Can’t We Stop Them.