a book
I have published a book written for the general public, about approachable ways to discover math in our everyday lives. The Korean title is 인생에서 수학머리가 필요한 순간 and the English translation is Moments in Life when You Need Your Math Brain. (The original title was “Spacing Out with Math” which has been the title of my public lectures for a long time.)
It is available in Korean only. You can find it here (교보) or here (예스24).
Someday, I will put the english translation of the 10 chapters (from 0 to 9, including 4.5).