Only Korean themself can move in Northkorean territory without fearing that they will be recogniyed as enemy soldiers.
Best of them are selected and assigned to the commando.
They can dress like enemy soldiers and get to places where other commando members must use weapons. They know martial art taekwon-do and fight for freedom of their country.

Since the beginning of Korean War Kim joined guerillaz group and fighted against enemy in the mountains. However his group falled in trap and all his comrades died, only he survived, then he walked wounded 40 kilometres until he crossed the front line and allied soldiers helped him to get into hospital.

After being healthy again, Kim got the medal for bravery and decided to join the army again and continue the battle for freedom. His nickname is ´Kato´.