EPEX (이펙스, short for Eight Apex) is a South Korean boy group under C9 Entertainment, consisting of eight members: Wish, Keum, MU, A-Min, Baekseung, Ayden, Yewang and Jeff.

They debuted on June 8, 2021, with their first mini album, Bipolar Pt.1 : Prelude of Anxiety with “Lock Down” serving as its title track. In 2021, the group released their album BIPOLAR Pt.2 : 사랑의 서 (Prelude of Love) kicking off their ‘Anxiety’ and ‘Love’ series which have been released alternatively ever since.