(English) After graduating from Duksoo Commercial High School, Yoo Sungoh studied philosophy at Yonsei University before taking a graduate-level course in counselor education at Sookmyung Women’s University, Graduate School of Education. He taught ethics, ideas and philosophy in high school for 27 years and authored books including How Much More Must I Cry Since I Am Not Lonely Even When I Am Alone (poetry collection), You Have to Change to Change, and Understand the Child’s Psychology of Studying.

This is the conclusion I reached after studying philosophy:  philosophy is the various lenses through which we view the world. All humans encounter the questions, “Where did I come from? What do I do? Where am I headed?” like a rite of passage. This book is a study into the lenses used to address what it is to be human.

(Chinese) 德寿商业高中毕业后，考入延世大学学习哲学，后就读于淑明女子大学教育研究生院教育咨询专业。作者在高中教了27年的伦理、思想和哲学，著有《直到独自一人也不孤独之前，还会伤心多久》(诗集)、《只有改进，才有变化》、《理解孩子的学习心理》等作品。

学了哲学后，作者得出的结论是哲学是眼界的差异。像必经的仪式一样，每个人都会面对“我从哪里来，要做什么，往哪里去”的问题。本书着重探讨了看待人类这一存在的眼界。