- Full name: Yu Siah
- Date of Birth: September 17, 1995
- Nationality: Korean
- Blood type: A
- Group: Oh My Girl
- Agency: WM Entertainment
- Debut: 2015
- Position in the group: lead vocalist, main dancer
- Family members: Mom, dad, older brother, Yooa
- Nickname: ‘orange girl’ ‘pea Yooa’
- She wanted to become a singer because she had too many stalkers when she was young
- Yooa’s favorite artist is Beyonce