Mr. Kong, the author of this book, although his skills in farm is taken off like crazy, he feels emptiness inside of his mind. Whenever he has such feelings, he just takes the train to go to a bookstore in the large city, which is the only space for him as the shelter. He reads maths and physics right standing on for 3 hours. Sometimes, whenever he buys old and interesting resell books, he feels comfortable in his deep heart.  

It's been 13 years after he started farming. One day, he also uses train and finds it an advertisement, which promotes night-school for adults who dropped studying and wants learning again. Suddenly, he gets adrenaline as he sees it. He wants to enroll the school right away and decides to drop by there. However, he feels disappointments, taking the class due to easy level of the class. At the end of it, the teacher asks "Who has a question for this class?" Mr. Kong raises his hand and tells him "What is potential energy?", which is the question that he's had after high school graduation for long time. After the answering, he realizes that it is the right way for his life and asks the teacher for studying of physics. He, Mr. Lee is a graduate in KAIST which is a university that is especially specialized in science and then he graciously answers "yes". From the moment, his life has been changed from one hundred eighty degrees. Finishing his work, he's willing to go to night-school to learn physics from his new teacher. On weekend which is without class, he goes to KAIST for his learning at late ages, in mid-30s.  

It's time to wrap up today's work.

Thanks for reading as well :)

Bye.