Lee Joon-hyuk (Korean: 이준혁) is a South Korean actor. He is best known for his role as Seo Dong-jae in Stranger (2017–2020). His other notable works include Naked Fireman (2017), A Poem a Day (2018), Designated Survivor: 60 Days (2019), 365: Repeat the Year (2020), Dark Hole (2021), Vigilante (2023), and Love Scout (2025).