Epex (Korean: 이펙스, romanized: Ipegseu, style as EPEX, short for Eight Apex) is an eight-member South Korean boy group formed by C9 Entertainment in 2021, consisting of Wish, Keum, Mu, A–Min, Baek Seung, Ayden, Yewang and Jeff. The group debuted on June 8, 2021, with their first EP titled Bipolar Pt.1: Prelude of Anxiety.