Joel Alexander Kim Booster (born Kim Joonmin; February 29, 1988) is a South Korean-born American actor, comedian, producer, and writer. He co-produced and wrote for Big Mouth and The Other Two and as an actor has appeared on Shrill, Search Party, and Sunnyside. In 2022, he wrote, produced, and starred in the Hulu romantic comedy Fire Island, a modern adaptation of Pride and Prejudice with a main cast of Asian American actors.
Born Kim Joonmin in Jeju Island, South Korea, Booster was adopted by an American couple as an infant. He was raised in Plainfield, Illinois, in a "conservative, white, Evangelical Christian family" and was initially homeschooled. He went to public school for the first time when he was 16, which he described as his "first time being around non-religious people." He knew he was gay from childhood but kept it a secret. His senior year in high school, his parents found out he was gay by reading his diary where he had described his sexual encounters with other boys. Booster moved out and began to couchsurf until he stayed with a family friend.
He studied theater at Millikin University for his bachelor's degree.

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