Hallim Park is already in English/romanization form. If you're asking for the Korean name to be romanized:
할림공원
Hallim Gongwon
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Hallim Park (Korean: 한림공원) is a park in Hallim, Jeju City, Jeju Province, South Korea. It was established on October 10, 1971. The park was founded by local Song Bong-gyu (송봉규; 1931–2023), who developed it from barren land to the present state. The park contains the lava caves Hyeopjae (협재굴) and Ssangryong (쌍룡굴; alternatively Ssangnyong or Ssangyong; 쌍용굴). — 영문 출처: Wikipedia