With this new policy kids at the age of 13 can spend time in jail instead of youth correction centers:

The age of criminal responsibility will be lowered by one year from the current 14, the Ministry of Justice said Wednesday, announcing measures to cope with an increasing number of serious crimes committed by juveniles.
The ministry said it will revise the criminal and juvenile laws to lower the criminal age limit to be able to charge youths criminally from the age of 13.
Currently, minors under the age of 14 cannot be convicted of a crime in South Korea. If such children commit offenses, they are referred to community service programs or youth correction institutions.
Under the soon-to-be revised laws, 13-year-old middle school first or second grade students, for instance, will be subject to criminal punishment if they commit a crime.
Yonhap
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