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Republic of Korea
Practice Relating to Rule 137. Participation of Child Soldiers in Hostilities
The Republic of Korea’s ICC Act (2007) provides for the punishment of anyone who commits the war crime of “using [children under the age of 15 years] to participate actively in hostilities” in both international and non-international armed conflicts. 
Republic of Korea, ICC Act, 2007, Article 10(3)(5).
In 2006, in its initial report to the Committee on the Rights of the Child under the 2000 Optional Protocol on the Involvement of Children in Armed Conflict, the Republic of Korea stated:
4. The Republic of Korea remains committed to protecting children from involvement in armed conflict by respecting the principles of the Convention on the Rights of the Child and the Protocol … Major national measures taken to implement the Optional Protocol are as follows:
(b) An amendment was made to a specific provision in the Air Force Regulations that had formerly stipulated that any person under the age of 18 among students at the Air Force Aerial Science High School would perform basic wartime duties in times of war. This amendment effectively prevents any person under the age of 18 from being involved in armed conflict under any circumstance. 
Republic of Korea, Initial report to the Committee on the Rights of the Child under the Optional Protocol to the Convention on the Rights of the Child on the Involvement of Children in Armed Conflict, 1 April 2007, UN Doc. CRC/C/OPAC/KOR/1, 16 July 2007, § 4(b).