EPEX (Korean: 이펙스), formerly known as C9ROOKIES (Korean: C9루키즈), is an eight-member boy group under C9 Entertainment. The group consists of the members Wish, Keum, MU, A-Min, Baekseung, Ayden, Yewang, and Jeff.

They made their debut on June 8, 2021, with their first EP album, BIPOLAR Pt.1: 불안의 서 (Prelude of Anxiety). The name EPEX stands for "the gathering of eight youths reaches eight different apexes", symbolizing the eight members coming together to form a collective, high-performing team.