Jung Eun-joo (Korean: 정은주; born April 29, 1991), known professionally as Jung Hye-sung (Korean: 정혜성), is a South Korean actress and model.
Jung began her acting career in To the Beautiful You (2012) and gained recognition through supporting roles in Love in the Moonlight (2016) and Good Manager (2017) before landing her first lead role in Oh, the Mysterious (2017).
In 2019, Jung made her big-screen debut with the romance film Mate starring opposite Shim Hee-sub.
In August 2022, Jung ended her contract with J-Wide Company and decided not to renew it.
In August 2026, Jung signed with new agency Jellyfish Entertainment.