People often call her "Princess Arin" because of her grace and charms.
She is the youngest and the tallest member of OH MY GIRL.
Arin's ideal type is someone who works hard at whatever he does.
Arin's favorite movie is "The Kissing Booth"
Arin's favorite game to play is PUBG Mobile
Arin described her personality as calm and talks little when she's outside. She likes being alone and not talking about her worries or feelings. The 'maknae' image of being cute and doing a lot of aegyo is very different from who she actually is.
Arin is friends with WJSN's Dayoung and Weki Meki's Yoojung.
She joined WM Entertainment as a trainee in 2013.
She has a younger brother named Choi Seokjun
Among the group, Arin is closest to Seunghee. They also share a room together in their dorms.