Before the Korean letters they used today, Koreans used Hanja. It is a Chinese transcript, to read and write. Hanja was complicated, and King Sejong noticed that only educated and privileged are literate. with the help of scholars, they created a set of letters that were unique, easily learnable, rendering it accessible and usable for the common people.
In 1446, the first Korean alphabet was proclaimed published in the manuscript “Hunmin Chong-um” (Proper Sounds to Instruct the People)
“Being of foreign origin, Chinese characters are incapable of capturing uniquely Korean meanings. Therefore, many common people have no way to express their thoughts and feelings. Out of my sympathy for their difficulties, I have created a set of 28 letters. The letters are very easy to learn, and it is my fervent hope that they improve the quality of life of all people.”
-King Sejong in the proclamation of Hangul
A Korean syllable is divided into three parts: Ch’osong (initial consonant), chungsong (peak vowel), and chongsong (final consonant).
Because of its simplicity and the rather small number of letters, Hangul is very easy to learn even by children and foreigners. Studying Hangul intensively will make anyone recognize the characters instantly.
So if you start memorizing the characters now, and at least study for two hours.