■ You can quickly search by topic (Basic Common Sense, Elementary, Secondary, High School, SAT, Public Officials, Personality, Family Hun, filial piety, Friends, Couple, Zodiac, Family, Lesson, Academic, Friendship, Three Kingdoms...).

■ This is an app that explains lion idioms necessary for those who learn or enjoy idioms.

■ You can easily explore and learn about 43 essential dead acronyms, similar words (lion acronyms), and today's dead acronyms.

■ There is a skill test function (question, scoring, incorrect answer storage, recent score, average score, capture) so you can easily view your skill test anytime, anywhere.

■ Learn about the meaning of the dead acronyms and improve your skills using the description app.

■ It can be used by all ages, including teenagers and adults, and you can easily and easily learn acronyms and enjoy a quiz game.

■ Each text can be heard in Hangul (漢文) pronunciation with one click.

■ With a simple long-click, you can save and use acronyms in a notepad and delete them in a notepad.

■ Each word (sentence) can be easily linked with Naver Hanja Dictionary, Dictionary App (when installed), Papago Translator App (when installed), etc. to improve learning efficiency.

■ You can use study mode, quiz mode, incorrect answer note, notepad, etc. You can conveniently use various functions by selecting options according to your taste.

■ Various options include Hangul (漢文) conversion, automatic (manual) conversion, automatic speed control, automatic to horizontal (vertical) conversion, vibration, background music, and capture function.

■ In the quiz mode, you can check the amount of learning, the percentage of correct answers, and the remaining amount of incorrect answers.

■ When selecting an incorrect answer in quiz mode, it is automatically saved as an incorrect answer note.