Thinking for a long time that studying can be an enjoyable process, author Jeong Jaeyeong has written several books on the topic. He has also taught writing to children for the past 30 years and studied how children should translate their parents’ nagging properly. The results of his studies are I Changed How I Speak, and My Child Studies; My Child, Who Couldn’t Write a Sentence, Has Now Started Writing; and How to Speak the Same Language with Mom and Dad. And when he regretted speaking harshly to his child, he wrote Why Did I Talk Like That to My Child?.