Esna (Korean: 에스나) 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 early songs.
As of 2017, Esna has departed from Rainbow Bridge World.
- eSNa The Singer
- Have A Drink
- Bite My Lower Lips (아랫입술 물고)
- I, I Love You
- A Little Lovin
- Me, Today (ft. San E)
- No Thanks
- The Fast Life (Kero One ft. Esna)
- What I See (Prepix ft. Yong Junhyung, Beenzino, Esna)
- Is It Love? (with Kero One)
- Mistletoe (with Geeks and Phantom)
- Leaving Las Vegas (Yoon Dohyun & Esna)
- Gentleman (with MAMAMOO)
- Destiny (with Seulong)
- Ahh Oop! (아훕) (with MAMAMOO)
- I Remember (Innovator ft. Esna)
- Love Comes (with Hwasa)
- "Lost in Myself (San E ft. Esna)
- ~42 (Primary ft. Sam Kim & Esna)
- Just Be the Way You Are (Hanhae ft. Esna)
ONEUS (Korean: 원어스) is the brother group to MAMAMOO.
On November 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
- RAISE US
- FLY WITH US
- IN ITS TIME
- Valkyrie (발키리)
- Twilight (태양이떨어진다)
- LIT (가자)
- A Song Written Easily (쉽게 쓰여진 노래)
- To Be or Not To Be
- Bbusyeo (뿌셔)
- Last Song (with ONEWE)