North Korea is not the unpredictable mystery many consider it to be — but it is more dangerous than some assume, especially some in South Korea, U.S. intelligence official Sydney Seiler said Friday.

Seiler, who has over 37 years of experience related to Korean affairs, is the national intelligence officer for North Korea at the National Intelligence Council. Before that, he was a senior analyst at the U.S. Forces Korea (USFK), the U.S. special envoy for the Six-Party Talks and the director for Korea on the National Security Council (NSC).