Heo Nam-jun (born June 9, 1993) is a South Korean actor. After making his debut in 2019, he gained widespread public attention for his standout performance as a ruthless antagonist in the thriller Your Honor (2024). He quickly established himself as a versatile leading man, starring in the thriller-romance When the Phone Rings (2024–2025) and anchoring the hit SBS fantasy romantic comedy My Royal Nemesis (2026).