Yoo Shi Ah (유시아; born 17 September 1995), better known by her stage name YooA (유아), South Korean idol signed to WM Entertainment. She debuted in 2015 as a member of South Korean girl group Oh My Girl under WM Entertainment. YooA officially made her debut as a solo artist in September 2020 with her first extended play, [Bon Voyage]Bon Voyage[/Bon Voyage].