CIX (Complete in X) is a South Korean boy group under C9 Entertainment. They debuted on July 23, 2019, with their mini-album ‘HELLO’ Chapter 1. Hello, Stranger. The group consists of four members, BX, Seunghun, Yonghee and Hyunsuk. Former member BAE JINYOUNG, who pioneered the group’s debut anticipation as a member of project group WANNA ONE, left the group in August 2024. BX participated in MIXNINE and YG Treasure Box, the latter along with Seunghun.

The group has released several Top 10 albums in South Korea, including Hello Chapter Ø: Hello, Strange Dream which gave them their first chart-topper in the country. The group’s singles have also consistently landed in the Circle Music chart.