Guardian is a computer security forum where students meet weekly to share knowledge on computer security-related issues and educate each other. The club members work on real-world projects during the summer break. The Guardian club participates in almost all hacking contest in Korea. the nnns team, formed by Guardian members and members of the 'Song of Freedom' group, a famous hacking group in Korea, won the top prize in ISEC 2010 CTF organized by the Ministry of Public Administration and Security.