Reading, for work, a book on Asian medicine by (sounds like) Ee Soh In--it's written in both Korean and in Chinese. He's only just started it but right now he's reading about the yin and yang and chi.

His favorite book of all time--the ancient Chinese philosophical text, I Ching, or, in English, The Book of Changes. He had to catch his train before he could tell me why, but, from reading the forward to the English translation that I linked to, it's profound to the point of being incomprehensible to anyone but ancient Chinese philosophers and, apparently, brilliant acupuncturists.