Yoo Shi-ah (유시아), also known as YooA, is the Main Dancer, Lead Vocalist, and Face of the girl group Oh My Girl under WM Entertainment.
She debuted as a member of OH MY GIRL on April 21, 2015 with the group's self-titled mini album.
YooA was, alongside other 6 female idols, in “Idol Drama Operation Team” tv program and they created a 7 members girl group, called Girls Next Door. She is best known for her dancing skills and she would often appear in dancing programs such as "Hit the Stage" (2016).
In November 2016, she debuted as a member of the Inkigayo project group, Sunny Girls, with the single, "Taxi".
On September 8, 2020 YooA made her solo debut with the mini album titled "Bon Voyage"