Jang Keun-suk (Korean: 장근석; Hanja: 張根碩) is a South Korean actor and singer. He is best known for starring in the Korean television dramas Beethoven Virus (2008), You're Beautiful (2009), Mary Stayed Out All Night (2010), Love Rain (2012), Pretty Man (2013), The Royal Gambler (2016) and Switch (2018).