His most important works are collections of poems "Children of Korea", "Flower Letter" and "Our Beautiful Country".

The words of the song "Children's Union March" and the poem "Footstep" are still popular among children.

"Children's Union March" written right after the liberation of the country from the Japanese colonial rule sings of the Korean children's oath to prepare themselves as sons and daughters of a new democratic Korea with their pride of being members of the Korean Children's Union.

"Footstep" represents the blissful life of the children through a vivid expression of their mind and emotion.

His works are of weighty significance in the history of juvenile literature.