ViVi (Hangul: 비비) is the fifth revealed member of LOONA and a member of its first sub-unit, LOONA 1/3.

She was born as Wong Ka Hei (Cantonese: 黃珈熙) on December 9, 1996 in Hong Kong.

She debuted on February 14, 2017 as a member and subsequently released her solo single album ViVi on April 17, 2017.