Word Builder lessons are designed to help you understand how to expand your vocabulary by learning/understanding some common and basic building blocks of Korean words. The words and letters introduced through Word Builder lessons are not necessarily all Chinese characters, or 한자 [han-ja], and although many of them are based on Chinese characters, the meanings can be different from modern-day Chinese. Your goal, through these lessons, is to understand how words are formed and remember the keywords in Korean to expand your Korean vocabulary from there. You certainly don’t have to memorize the Hanja characters, but if you want to, feel free!
Learning different expressions and sentences derived from a keyword is a very effective way not only to understand the word in the context but also to improve your sentence building skills, like you practiced with this lessons. Check out My Weekly Korean Vocabulary e-books with which you can learn 7 new keywords every week with 20 accompanying sample sentences followed by vocabulary note for each keyword!