The NMIXX Documentary traces NMIXX's full journey — from pre-debut training days to their rise as one of K-pop's most technically skilled girl groups. It focuses on their origins, their artistry, and the personalities behind the members.
| Actor | Role |
|---|---|
 Kim Ji-wooSelf | Self |
 Jang Kyu-jinSelf | Self |
 Oh Hae-wonSelf | Self |
 BaeSelf | Self |
 SullyoonSelf | Self |
 Lily Jin MorrowSelf | Self |