He is a public interest informant who became the driving force for the presidential campaign of Roh Tae-woo that year.
He was questioned by Lee Seung-sup and Chief Kim Hyo-su to confess his revolutionary activities and other members.
He came back to Seobingo and was working with Kim Seong-seop, Se-jang Lee Seung-seop, Deputy Director Lee Deok-ryeol, Park Dae-ho and Cho Jae- He put three floppy disks in his bag and escaped the Security Command in the early morning of September 23, 1990.
On September 25, he called a senior colleague who worked as a reporter for the National Press Workers' Union and met him at Jongno-gu, Seoul and revealed that he was carrying materials from the Armed Forces Security Command.
At that time, the data that he revealed included the house structure, entry and escape route, and relatives' residence.