Olivia Marsh (born September 26, 2000 in Newcastle, New South Wales) is an Australian-South Korean singer. She is also known as Mo Gyuna (모규나). She made her debut under MPLIFY with the digital single "42". She is the older sister of NJZ's Danielle. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.