[2][3] He wrote the taoist work, The Principles of Transformation of Substances (Tungap ipsong pop), also translated as Mythical Form of Martial Art (Tungkapbop) or The Principles of Evading Stems (Tun'gap ipsong pop).
[2][3][4] His Theory of Geomancy (Pung-su-sol) is the earliest recorded reference to geology in Korean science.
[1] In 797 he was appointed as the envoy to Japan's Nara Court, where he is said to have become one of the favorites of the Japanese Emperor Kōnin.
[2] He may have been the same Kim Am who published a book (Ha-do Keui) about his travel to Japan about that time.
[7][8] He was also a military leader and theorist, commanding the Paegang Garrison, where he is said to have trained his troops in a "six column battle formation".