This is a vocabulary book for foreigners learning Korean, introducing essential vocabulary that must be known at the advanced level.
It is divided into 17 categories, including verbs, nouns, adjectives, adverbs, and onomatopoeia, depending on the part of speech and the nature of the expression, and each category provides explanations of 30 to 50 vocabulary words as headings.
It consists of practice problems of various types, and includes problems of the same or similar types, especially considering learners preparing for the Test of Proficiency in Korean (TOPIK).

For advanced learners, proverbs, idioms, and Chinese character expressions are divided into two parts: explanations of meaning and practice problems, to help them understand Korean culture and speak Korean more fluently and naturally.