So Close Yet Far (Gakkabgodo meon gil)(1978)

In-chul in his fifth year gets lost due to a ship wreck on his way back from a remote island and drifts to the border between the South and North Korea. In-chul meets North Korean boy Dong-man who collects used metals for living. Although difference of their background limits their conversation, Dong-man is moved by In-chul's innocence and cross the border with him. Unfortunately, they get shot by the army of North Korea and die.