Roh Jeong-eui (Korean: 노정의; born July 31, 2001) is a South Korean actress. She is known for her roles as Dong-i in the film Phantom Detective (2016), Hong Si-a in 18 Again (2020), and NJ in Our Beloved Summer (2021–22). More recently, she's starred in the TV series Dear M (2022) and the Netflix movie Badland Hunters (2024), and will be in the tv series Hierarchy (2024).