Esna is an American singer-songwriter who was under the same entertainment as MAMAMOO. The two have collaborated together in a few tracks, and she has written and composed a lot of MAMAMOO's songs.
She is mainly known for writing the lyrics to the hit Some.
- eSNa The Singer (2015)
- Have A Drink (2019)
- I, I Love You (2014)
- A Little Lovin' (2015)
- No Thanks (2016)
- Attention (2016)
- Wayogayo Vol. 1 (with Geeks & Phantom) (2013)
- Gentleman (with MAMAMOO) (2014)
- Ahh Oop! (아훕) (with MAMAMOO) (2015)
- Love Comes (with Hwasa) (2017)
ONEUS (원어스) is the brother group to MAMAMOO.
In November of 2017, RBW introduced the debut project "RBW Trainee Real Life – We Will Debut" to launch their new boy group. Keonhee, Hwanwoong, Ravn, Seoho, and Xion were announced to be the RBW BOYS. On September 27, 2018, ONEUS and ONEWE (formerly MAS) released a pre-debut single Last Song.
They debuted on January 9, 2019 with their first mini-album Light Us, and their single Valkyrie.
- Light Us (2019)
- Last Song (2018)