Park Eun-seok is a South Korean actor. He is best known for his work in theatre and is also known for his breakout performance in the 2020 television drama The Penthouse (2020). Born in South Korea, Park immigrated to the US with his family at the age of 7, settling in Long Island, New York. He returned to Korea in 2005 at the age of 22 to pursue an acting career. Being a permanent resident of the United States at the time, Park voluntarily served in the South Korean military in order to improve his Korean citizenship. He later gave up his permanent citizen status in the US after being discharged from the Korean military.