Junior high school student who attacked South Korean ruling party member claimed to be 15 years old...Is there a ``3%'' chance of criminal punishment?

It has been revealed that the perpetrator who attacked Bae Hyun-jin, a member of South Korea's ruling party People's Power, was a minor. The attacker, Mr. A, claimed to be 15 years old, and there was also talk of him being a "juvenile trespasser."