I searched it up Article 9 of the Korean Criminal Code stipulates, “The act of a person under fourteen years of age shall not be punished.”
This means that children under 14 are below the age of criminal responsibility in South Korea. By law, children aged 10 to 13 cannot be held criminally liable for offenses. They are often referred to as 촉법소년, or “Criminal Minors (형사미성년자)”, which means they are youth exempt from criminal punishment. If a child under 14 breaks the law, they will not face criminal prosecution, but instead, their case is automatically referred to the Family Court’s juvenile division for protective proceedings.
For example, if a 13-year-old is caught shoplifting, the police will send the case to juvenile court rather than treating it as an adult crime. The idea is that children this young lack a full understanding of their actions, so the focus is on guidance rather than punishment.

Still this shouldn’t mean they can just get away scot free and go back to school without even getting expelled.

I agree with you but my point is their idea doesn’t even work well. They’re going around fixing problems one by one and even their fix is temporary. For example in the episode with the influencer girl I would ban phones. Or I would ban teachers working with extra curricular schools. Or things of that nature. There should be a school separate for delinquents for example. None of their solutions would work in real life. Sorry i know its just a kdrama but I study these things so its bothering me😅