Plot: Gun Woo officially joins the team and puts his investigation skills to use as they track a hacker known as the Mermaid.
Cast
Ian Kim BeomCha Gun-wooIan Kim Beom was 25 in Hidden Identity - Season 1 - Episode 4 (Episode 4).
Birthday: Fri, Jul 07 1989
Park Sung-woongJang Mu-wonPark Sung-woong was 42 in Hidden Identity - Season 1 - Episode 4 (Episode 4).
Birthday: Tue, Jan 09 1973
Yoon SoyYoo Min-jooYoon Soy was 30 in Hidden Identity - Season 1 - Episode 4 (Episode 4).
Birthday: Sat, Jan 05 1985
Lee Won-jongChoi Tae-pyeongLee Won-jong was 49 in Hidden Identity - Season 1 - Episode 4 (Episode 4).
Birthday: Sat, Jan 01 1966
Kim Tae-hunMin Tae-inKim Tae-hun was 40 in Hidden Identity - Season 1 - Episode 4 (Episode 4).
Birthday: Mon, May 26 1975
Kim Min-junTeacher JungKim Min-jun was 38 in Hidden Identity - Season 1 - Episode 4 (Episode 4).
Birthday: Tue, Aug 24 1976