CIX (pronounced as C-I-X, short for Complete in X) is a five member South Korean boy group formed by C9 Entertainment in 2019, consisting of Lee Byoung-gon, Kim Seung-hun, Kim Yong-hee, Bae Jin-young and Yoon Hyun-suk.
The group debuted on July 23, 2019, with their first EP titled HELLO Chapter 1: Hello, Stranger.
Bae Jin-young competed in Mnet’s Produce 101 Season 2 in April 2017 representing C9 Entertainment, soon finishing in 10th place and joining project boy group Wanna One. In October 2017, Lee Byoung-gon appeared as a contestant on JTBC’s Mix Nine, finishing in 9th place thus earning a spot in the winning group. As both Lee and fellow bandmate Kim Seung-hun were YGE trainees, in 2018 the two competed in the survival show YG Treasure Box for the label’s next boy group, Treasure 13 where both failed to debut in the finale. In November 2017 Kim also appeared on Mnet survival program Stray Kids while still a YGE trainee.
Ahead of debut, the group broadcast the reality show Hello CIX on June 4, 2019 through V Live. The show consisted of 10 episodes showcasing the group’s various charms and road to debut. On July 23, 2019 CIX made their debut with EP Hello Chapter 1: Hello, Stranger and lead single “Movie Star”. They held their debut showcase on July 24 at Olympic Park SK Handball Arena.