A biography and evaluation of the legacy of Go-un Choi Chi-won, one of Korea's most interesting and iconic historical figures. He is considered a hero of traditional Korean Daoist, Buddhist and Confucian culture. Following a remarkably successful career as a brilliant Confucian government official in Tang China and then back in his native Gyeongju, he was one of few Koreans who achieved the highest level of Daoist sage-hood, achieving Shinseon (spirit-immortal)...