Lee Yoo-mi as Lee Na-yeon: A privileged student of Class 2-5, Na-yeon is repeatedly shown to be born with a golden spoon, which singles her out for criticism amongst her peers. Actress Lee Yoo-mi has enjoyed a stellar two years, with her performance in All Of Us Are Dead following hot on the heels of her turn as Ji-yeong in .
Kim Bo-yoon as Seo Hyo-reong: One of class 2-5's lesser-known students, Hyo-rung is played by Kim Bo-yoon, whose fledgling acting career began in 2020 with a supporting role in the 2020 South Korean movie Hotel Lake
Kim Joo-ah as Yoon I-sak: A student of Class 2-5 and On-jo's best friend, Yoon I-sak is played by Kim Joo-ah in her first accredited role of any kind.
Son Sang-yeon as Jang Wu-jin: Another student of class 2-5, Jang Woo Jin is also Ha-ri's younger brother whom she attempts to locate throughout All Of Us Are Dead. Actor Son Sang-yeon has starred in various live shows, television series, web series, and films since his 2016 acting debut.
Ham Sung-min as Han Gyeong-su: Cheong-san's close friend and confidante, Gyeong-su is another member of class 2-5 at Hyosan High. Gyeong-su is played by Ham Sung-min, best known as a recurring cast member in the Revenge.
Jin Ho-eun as Jung Min-jae: A second-year student and talented member of the school's archery club, Jung Min-Jae aids Ha-ri in the search for her younger brother. Min-Jae is played by Jin Ho-eun, with All Of Us Are Dead being the actor's first credited role.
Oh Hee-joon as Son Myung-hwan: An older student who initially leads the bullying at Hyosan High, Myung-hwan is later ousted by the arguably even more callous Gwi-nam. Myung-hwan is played by Oh Hee-joon, who has enjoyed a fruitful K-drama television career since 2013.
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Kim Byung-chul as Lee Byeong-chan: A reserved science teacher, Byeong-chan carries emotional scars from his childhood that become greatly exacerbated as grips Hyosan High. Byeong-chan actor Kim Byung-chul is best known for playing Cha Min-hyuk in the television series Sky Castle.
Lee Min-goo as Lee Jin-su: A shrinking violet of a student, Jin-su is also revealed as Byeong-chan's son, who was himself was frequently bullied during his own time at Hyosan High. Jin-su represents actor Lee Min-goo's first accredited role of any kind.
Bae Hae-sun as Park Eun-hee: A member of the National Assembly representing Hyosan, Park Eun-hee is key in the region's efforts to contain and fight back against All Of Us Are Dead's deadly virus. Eun-hee is played by Bae Hae-sun, who is best known for her roles in almost including Hi Bye, Mama!, Hotel del Luna, and Don't Dare to Dream.
You as Kim Y/n-Jeong: A student of Class 2-5, Cheong-San's And On-jo's best friend.
