Kyoung-ju is the main author of the threat intelligence report “Campaign Rifle: Andariel, the Maiden of Anguish”, published in 2017. Sojun worked at KrCERT/CC for seven years, analysing malware and responding to incidents, and is one of the authors of "Operation Bookcodes" published by KrCERT/CC in 2020. Recently, Sojun has been focusing on threat intelligence by expanding to DDW and cybercrime as well as APT at TALON, S2W. Before joining the S2W, he worked as part of the Computer Emergency Analysis Team of the Financial Security Institute and was the main author of "Campaign DOKKAEBI: Documents of Korean and Evil Binary", published by FSI in 2018.