On the evening of July 8, he found two girls drowning in the deep waters of the Mungu River.

He immediately jumped into the water to save Ri Hyon Ju, second grade girl of the same school. Then he again went back to save Sim Yong Sun, first grade girl of Rinsan Secondary School. He was so exhausted that he could not rise up again after pushing Sim Yong Sun out of water.

Teachers, parents of the two girls and residents of the county were deeply moved by the boy's deed and said that his devotion is a revelation of the noble spiritual world of members of the Korean Children's Union proudly growing up to be masters of future and pillars of the country under the care of the Workers' Party of Korea.