Kim Jung-hyun (born April 5, 1990) is a South Korean actor. He is best known for his lead roles in popular television series School 2017 (2017), Welcome to Waikiki (2018), and Time (2018). He gained international recognition by starring in the dramas Crash Landing on You (2019–2020) and Mr. Queen (2020–2021), which rank amongst the highest-rated Korean dramas in cable television history.