- Full name: Choi Yeawon
- Date of Birth: June 18, 1999
- Nationality: Korean
- Blood type: O
- Group: Oh My Girl, Oh My Banhana
- Agency: WM Entertainment
- Debut: 2015
- Position in the group: sub vocalist, main dancer
- Family members: Mom, dad, younger brother, Arin
- Nickname: ‘chick Arin’, ‘baby rin’, ‘choi arin’
- She is left handed and loves pink
- Arin is the new MC of ‘Music Bank’