Olivia Hye (Hangul: 올리비아 혜) is the twelfth and last revealed member of LOONA and a member of its third sub-unit, LOONA / yyxy.
She was born as Son Hye Joo (Hangul: 손혜주) on November 13, 2001 in Uijeongbu, Gyeonggi Province, South Korea.
She debuted on March 17, 2018 as a member and subsequently released her solo single album "Olivia Hye" on March 30, 2018.
She attended Sung shin Girl's High School in Seoul along with Choerry. They are in the same year group. At first her classmates did not know she was also a member of LOOΠΔ because she was a trainee and could not reveal it until her teaser images were released, she pretended not to know who Choerry is and kept her identity a secret.
Olivia Hye was teased from March 8, 2018, until March 30, 2018, when her single album Olivia Hye was released and subsequently debuted as a member of LOONA.
Coincidentally with her album's release, BlockBerry Creative published a NAVER article featuring Yves, JinSoul and HeeJin behind the scenes of "Egoist".
Her first official fan event was with Go Won on April 7, 2018. Her second fan event was held solo on April 14, 2018. Her third fan event was also held with Go Won on April 22, 2018.
Olivia Hye later debuted as a member of LOONA / yyxy with members Yves, Chuu and Go Won on May 30, 2018 with the mini-album beauty&thebeat.