Son Hye-ju (손혜주) is the twelfth and last revealed member of LOONA with the name of Olivia Hye (올리비아 혜) and a member of its third sub-unit, LOONA / yyxy. She is a South Korean singer. In September 2023, she redebuted as HyeJu (혜주) in Loossemble under the CTDENM label.