Annyong Korean Language School is a free educational app available on Android that transforms the popular YouTube channel into an interactive learning platform. Users can engage with the app's diverse features, including direct handwriting in Hangul on their smartphones, eliminating the need for paper and pen. The app caters to all proficiency levels, offering grammar exercises and challenges designed to enhance users' understanding of the Korean language.

In addition to grammar, the app includes various listening exercises that help users improve their auditory skills, such as transcribing spoken Korean and translating it into Japanese. Vocabulary building is emphasized through unique methods that connect Korean words with their kanji counterparts. By the end of the course, users can expect to comprehend Korean dramas and daily conversations, making this app an excellent resource for anyone looking to learn Korean.