<I Am Hangeul> is a work by Jaejun Han, installed on the outer wall of the Hangeul Hall. The marvelous three-dimensional shape means a 4-dimensional character. Hanja, which is a hieroglyphic character, is one-dimensional, Japanese Kana, a syllabary, two-dimensional, Roman, a consonant character, three-dimensional, and Hangeul, which contains sound properties, is a four-dimensional character. It was called 'Qualification Letter'. It was made by fixing the steel frame to the outer wall.