Park Hyun-Soo didn’t look like a man on chemotherapy. Forty-one and with a full head of black hair, he can hike the socks off anyone, but he prefers to take his time. Not exactly a forest ranger, Park is part of a new breed of Korean Forest Agency employee known as a forest healing instructor. He’d actually gone to graduate school for this, passing rigorous entrance qualifications. Although he began his career in a