During October 22-23, 2018, I was able to be part of the affair “Nuclear Proliferation International Historical Project (NPIHP) Visit to the Los Alamos National Laboratory.” Everything was new to me as I had never been in New Mexico as well as tasted unique atmosphere there. Retrospectively, it went very well. I have not only met great friends and colleagues but also been inspired by useful comments and remarks from different scientists I met in the course of the event. I by no means want to brag off, but I might be the first Korean-history researcher who gave a presentation regarding North Korean nuclear history. My sincerest thanks to the Woodrow Wilson Center and the LANL for granting me a chance to make another indelible memory.