(Korean: 씨아이엑스, pronounced as C-I-X, short for Complete in X) is a five member group formed by C9 Entertainment in 2019, consisting Bae Jin-young, BX, Seunghun, Hyunsuk and Yonghee.

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CIX debuted on July 23, 2019 CIX with their EP Hello Chapter 1: Hello, Stranger and lead single "Movie Star" which sells 70,000 copies within 2 months. On July 30th, 06 days after their debut showcase, the group placed first on The Show, earned the title of one the fastest winning K-pop acts.