Lee Jun-hyuk, born on March 13, 1984, is a South Korean actor. He began his career in 2007, gaining international recognition for his role as prosecutor Kim Young-joo in the drama *City Hunter* (2011). His breakthrough came with his portrayal of the complex and ambiguous prosecutor Seo Dong-jae in the acclaimed series *Stranger* (2017–2020), a role he reprised in the second season, earning him critical acclaim. His versatility is evident in works such as the thriller *365: Repeat the Year* (2020), where he played the leading role, and *Designated Survivor: 60 Days* (2019), where he portrayed a charismatic antagonist. In 2023, his role as the villain Joo Seong-cheol in the blockbuster film *The Roundup: No Way Out* brought him immense popularity and prestigious accolades, including the Blue Dragon Film Award for Best Supporting Actor. He is praised for his ability to bring depth to morally complex characters and for his strong screen presence.