Statue of King Sejong (Gwanghwamun)
The statue of King Sejong was dedicated on 9 October 2009, in a ceremony attended by attended by President Lee Myung-bak and other Korean government official, on a Hangul Day in celebration of the 563rd anniversary of the invention of the Korean alphabet by King Sejong, two months after the Gwanghwamun Plaza opening. The golden statue is 6.2 meters high (another source gives the statue height as 9.5 meters and yet another, 6.7 meters) and weights 20 tons. The king has one hand raised and another placed on a book. Sides of the statue display all of the hangul alphabet characters. In front of the statue there are small models of a celestial globe, a rain gauge, and a sundial, the invention of which is also traditionally attributed to King Sejong in Korea. While King Sejong is best remembered for his invention of hangul, he is also considered to have been involved in promotion of agriculture, literature, science and technology, as well as Confucian philosophy, in Korea.
Chinese family of scripts
The Hangul alphabet introduced in the 15th century was much simpler, and specifically designed for the sounds of Korean.
The alphabet makes systematic use of modifiers corresponding to features of Korean sounds.
Although Hangul is unrelated to Chinese characters, its letters are written in syllabic blocks that can be interspersed with Hanja. 
Such a Korean mixed script became the usual way of writing the language, with roots of Chinese origin denoted by Hanja and all other elements rendered in Hangul. Hanja is still used (but not very commonly like the Japanese) and is required in both North and South Korea.