Set 3 years after the first season, members of the National Security Service (NSS) team, including Jung Yoo Gun, Ji Soo Yeon and other agents attempt to pull the curtain on mysterious group IRIS.
Agent Yoo Gun is the leader of the NSS TF-A team. While he goes up against Baek San, Yoo Gun becomes involved in a case which changes his fate forever.
Jang Hyuk
Jung Yoo-gunKim So-yeon
Im Soo-hyang
Kim Yeon-hwaKim Yeong-cheol
Baek SanLee Beom-soo
Yoo Joong-wonOh Yeon-soo
Choi MinLee Da-hae
Ji Soo-yeonCha Soon-hyeong
IRIS Agent, Clerk