Lee Yoo-mi is a South Korean actress. She is known for her roles as Ji-yeong in Squid Game (2021) and Lee Na-yeon in All of Us Are Dead (2022). She won the Primetime Emmy Award for Outstanding Guest Actress in a Drama Series for her role as Ji-yeong in Squid Game, making her the first Korean actress to win in the category.

All of Us Are Dead is a South Korean coming-of-age zombie apocalypse horror television series. It stars Park Ji-hu, Yoon Chan-young, Cho Yi-hyun, Lomon, Yoo In-soo, Lee Yoo-mi, Kim Byung-chul, Lee Kyu-hyung, and Jeon Bae-soo. The series centers on a group of high school students in the fictional South Korean city of Hyosan, and their struggle to survive amidst a zombie outbreak. It is based on the Naver webtoon of the same name by Joo Dong-geun, which was published between 2009 and 2011. This series was filmed at Sunghee Girls' High School in Andong, South Korea.