why korean more often use hangul for they writing?

that's true, they always use the korean language in every activity and they proud about it, as i know Korean Language (hangul) created by the Korean King because they did not want to the same as Chinese and Japanese, so they create theiir own distinct language from chinese and japanese, so this language makes their identity... proud with their own...

Before the creation of Hangul , Hanja was typically used to write Korean by using adapted Chinese characters, while Hanmun sometimes used to write documents in classical chinese. In the 14th century of Korea, King Sejong the Great of Joseon Dynasty . He is the one who created the written language of Hangul that have 28 letter korean alphabet ,each hangul letter is based on a simplified diagram of the patterns made by mouth ,tounge and teeth when making the sounds related to character, so its really better to Hanja . Out of 5 korean old people only 1 can write and read of hanja character. Thats why ,King Sejong presided over 28 letter korean alphabet, with the explicit goal being that koreans from all classes would read and write .I hope this things that I know will help you ..

Hangeul, the Korean alphabet, was created in 1443 by King Sejong, the 4th King of Joseon Dynasty, and spread to the world in 1446. Before Hangeul, members of the upper class used Chinese characters, but commoners had a difficult time because there was no way to express themselves in writing. King Sejong realized that it was difficult for commoners to learn ideographic Chinese characters, so he invented phonetic Korean characters. Today, linguists acknowledge Hangeul as an original invention that is both systematic and scientific. Although learning Hangeul may seem like a daunting task at first, it is relatively easy to read and write Korean once you learn the nineteen consonants and 21 vowels. Actually, I am currently learning Korean language.