Park Yong-kyu (Korean: 박용규; born December 16, 1988), known professionally as Park Seo-joon (박서준), is a South Korean actor. He is best known for his starring roles in the television series Kill Me, Heal Me (2015), She Was Pretty (2015), Hwarang: The Poet Warrior Youth (2016–2017), Fight for My Way (2017), What's Wrong with Secretary Kim (2018), Itaewon Class (2020) and Gyeongseong Creature (2023–2024).[4] He has also appeared in films such as The Chronicles of Evil (2015), Midnight Runners (2017), The Divine Fury (2019), Concrete Utopia (2023), and The Marvels (2023).