Hangeul is a unique and scientific character representing Korea. In December 1443, King Sejong created Hangeul, which means the right sound to teach the people, and became the Korean writing system. It is a phonemic character consisting of 14 basic consonants and 10 basic vowels in modern standards. It can be combined with consonants and consonants, vowels, and vowels to form a new type. When used, it is also collected and written, so that a letter has a syllable characteristic that represents one syllable. In order to encourage the spread and research of Hangeul, October 9th is designated as a national holiday every year. It was intended to express the combination of consonants and vowels geometrically through the word “read-write-speak,” a letter that is easy to learn, can express various sounds, and expresses its beauty in a geometric form. Through this, I would like to show that Hangeul is a scientific letter that is easy to read, write, and speak.