Cast of All of Us Are Dead – Complete Actors and Roles Guide

Netflix’s All of Us Are Dead quickly became one of the streaming platform’s most-watched non-English series following its January 2022 premiere. Set entirely within the confines of Hyosan High School during a zombie outbreak, the show relies heavily on its ensemble cast of young actors portraying students, teachers, and rescue workers fighting for survival. The series adapts the Joo Dong-geun webtoon Now at Our School, bringing to life a cast that blends relatively unknown talents with seasoned Korean actors.

This guide provides a comprehensive breakdown of the series’ cast, from lead actors like Park Ji-hu and Yoon Chan-young to supporting performers across both seasons. Whether you’re trying to identify who plays Nam On-jo’s father or looking for confirmed details about the upcoming second season, the information below covers every major role in the production.

Who Is in the Main Cast of All of Us Are Dead?

The main cast centers on Class 2-5 students at Hyosan High School along with key adults caught in the outbreak. Park Ji-hu leads as Nam On-jo, with Yoon Chan-young portraying her childhood friend Lee Cheong-san. Cho Yi-hyun plays class president Choi Nam-ra, while Lomon (also known as Park Solomon) portrays former delinquent Lee Su-hyeok. The antagonistic forces are represented by Yoo In-soo as school bully Yoon Gwi-nam and Kim Byung-chul as science teacher Lee Byeong-chan, the creator of the Jonas Virus.

• The series launched the careers of several relatively unknown young actors at the time of casting.
• Park Ji-hu was officially added to the main cast on April 22, with Cho Yi-hyun, Lomon, and Yoo In-soo following on July 1.
• Kim Byung-chul brings his PhD in cell biology to the role of the virus-creating antagonist Lee Byeong-chan.
• Lee Kyu-hyung plays Detective Song Jae-ik, representing the police response to the crisis.
• Jeon Bae-soo portrays Nam So-ju, the 119 EMS Rescue Team captain and On-jo’s father.
• The show features multiple character arcs that evolve across the twelve-episode first season.
• Season 2 will introduce university-aged survivors as the surviving characters have aged out of high school.

Who Plays the Lead Roles: Nam On-jo, Cheong-san, and Nam-ra?

Park Ji-hu as Nam On-jo

Park Ji-hu stars as Nam On-jo, one of the two central protagonists alongside Lee Cheong-san. On-jo is a Class 2-5 student who shares a deep bond with Cheong-san that developed from childhood friendship into romantic feelings. Throughout the series, On-jo demonstrates resourcefulness and emotional strength as she navigates the terrifying circumstances alongside her classmates. Park Ji-hu was announced as part of the main cast for Season 2 on April 22, confirming her return for the upcoming season.

Yoon Chan-young as Lee Cheong-san

Yoon Chan-young portrays Lee Cheong-san, On-jo’s counterpart as both childhood friend and love interest. Cheong-san’s journey through the outbreak is marked by his determination to protect those he cares about, particularly On-jo. The character faces some of the series’ most intense moments as the situation at Hyosan High School deteriorates. Yoon Chan-young’s casting brought considerable attention to his performance, with viewers praising his portrayal of a typical high school student thrust into extraordinary circumstances.

Cho Yi-hyun as Choi Nam-ra

Cho Yi-hyun plays Choi Nam-ra, the accomplished class president whose intellectual abilities and leadership qualities prove invaluable during the crisis. Nam-ra develops a connection with Lee Su-hyeok (Bare-su), creating a parallel love story to that of On-jo and Cheong-san. Her character stands out for her strategic thinking and eventual transformation as the series progresses. Cho Yi-hyun was added to the Season 2 main cast on July 1 alongside other returning performers.

Supporting Cast and Key Student Roles

Key Supporting Students

Beyond the central quartet, the supporting cast fills out the ensemble of Hyosan High’s Class 2-5 and surrounding classes. Kim Bo-yoon portrays Seo Hyo-ryung, best friend to Kim Ji-min, while Kim Joo-ah plays Yoon I-sak, On-jo’s closest confidante. Ham Sung-min stars as Han Gyeong-su, representing students from disadvantaged backgrounds, and Ahn Seung-gyun plays Oh Joon-yeong, the academically accomplished second-top student. Im Jae-hyuk appears as Yang Dae-su, with Jin Ho-eun taking the role of Jung Min-jae, a final-year senior archery team member.

Among the more memorable supporting characters is Oh Hye-soo’s Min Eun-ji, a Class 2-5 student who becomes a bullying victim of Gwi-nam before undergoing a significant transformation as a “hambie” (halfbie zombie hybrid). Lee Si-hoon plays the live streamer known as “Orangibberish,” whose social media presence becomes relevant to the group’s survival efforts. Oh Hee-joon portrays Son Myung-hwan, the bully leader who creates conflict early in the series.

School Staff and Adult Roles

The adult cast members provide crucial context for the outbreak and the authorities’ response. Um Hyo-sup plays Principal Lee Jae-yong, whose decisions during the crisis have lasting consequences for the students. Additional staff members include Yoon Kyung-ho as Korean literature teacher Jung Yong-nam, Lee Sang-hee as teacher Park Sun-hwa, and Yoon Byung-hee as PE teacher Kang Jin-gu. Park Jae-chul appears as auxiliary police officer Jeon Ho-chul (or Nam Yong-pil), who befriends Detective Jae-ik as they work through the crisis.

Cast Ages and Backgrounds

Detailed age information for the cast at the time of filming is not widely documented in official sources. The casting philosophy prioritized authenticity for the teenage roles, leading to the selection of relatively unknown young actors who could convincingly portray high school students. This approach proved successful, with several cast members experiencing significant career growth following the series’ international success.

The core young cast members were selected to play characters aged approximately 17-18, consistent with their Class 2-5 status in the Korean school system. Adult actors portraying teachers and authority figures brought experience and balance to the ensemble. Season 2 will shift the surviving characters to university age, requiring some casting adjustments and the introduction of new younger performers to play fellow university students.

Season 2 Cast Announcements and Updates

Season 2 marks a significant transition for the series as the surviving characters have aged beyond high school into university life. Core Season 1 performers Park Ji-hu, Cho Yi-hyun, Lomon, and Yoo In-soo are confirmed to return in leading capacities. Park Ji-hu was officially added to the main cast roster on April 22, while Cho Yi-hyun, Lomon, and Yoo In-soo joined on July 1, signaling the production’s commitment to continuing their storylines.

New cast members have been announced to represent the evolved narrative. Roh Jae-won joins as Han Du-seok, a National Intelligence Service team leader who will likely interact with the now-older survivors. Lee Min-jae portrays Yong Ma-ru, Kim Si-eun plays So Ju-ram, and Yoon Ga-i stars as Lee Jong-a—all appearing as university friends of On-jo. Additional new cast members including Seo Ji-hoon, Kim Min, Ahn Dong-goo, Ryu Sung-rok, and Han Hyun-jun have been announced, though specific character details remain limited in available sources.

Key Milestones in the Series Timeline

Understanding the development of All of Us Are Dead provides important context for the cast and production. The original webtoon by Joo Dong-geun began serialization in 2009 under the title Now at Our School, establishing the source material that would eventually become the Netflix series.

1. 2009 — Joo Dong-geun’s webtoon Now at Our School begins serialization in South Korea.
2. January 2022 — Netflix releases all 12 episodes of Season 1 globally.
3. 2024 — Season 2 officially confirmed with returning main cast members.
4. April 22, 2024 — Park Ji-hu officially added to Season 2 main cast.
5. July 1, 2024 — Cho Yi-hyun, Lomon, and Yoo In-soo confirmed for Season 2 main cast.
6. 2024 — New cast members including Roh Jae-won announced for intelligence operative roles.

What Information Is Confirmed Versus Uncertain

Why the Casting Choices Matter

The casting strategy for All of Us Are Dead reflects a deliberate effort to balance relatability with professional credibility. Director Lee Jae-kyoo and the production team selected many relatively unknown young actors for the student roles, creating an immersive quality that resonated with audiences worldwide. This approach allowed viewers to connect with the characters as genuine teenagers rather than experienced performers playing younger roles.

The inclusion of established Korean actors like Kim Byung-chul, Lee Kyu-hyung, and Jeon Bae-soo provided necessary counterweights, lending weight to the authority figures and adult perspectives in the story. Kim Byung-chul’s particular background in science education adds an interesting layer to his portrayal of the teacher who created the Jonas Virus. The ensemble approach meant that numerous characters received meaningful screen time, preventing the spread-out effect that can weaken large ensemble productions. For more details on the Ready or Not 2 cast and release date, you can refer to the official cast and release date information.

Internationally, the series represented a significant moment for Korean content on global streaming platforms. The casting reflected Netflix’s investment in showcasing Korean talent to worldwide audiences, with subsequent Season 2 announcements receiving substantial media coverage through outlets like Variety and Soompi.

Where to Find More Information

For verified updates on the cast and upcoming seasons, several official sources provide reliable information. Wikipedia maintains a comprehensive cast section with references to primary sources and regular updates as new information becomes available. MyDramaList offers detailed character-by-character listings that complement the Wikipedia information. Netflix’s official series page provides promotional materials and confirmed cast announcements.

“The ensemble cast brings Joo Dong-geun’s beloved webtoon to life with remarkable intensity and emotional depth.”

— Series review commentary, Soompi

“Season 2 introduces intelligence operatives alongside returning favorites, expanding the universe beyond the high school walls.”

— Variety entertainment reporting

Summary and Next Steps

The cast of All of Us Are Dead represents a carefully assembled ensemble spanning established Korean actors and emerging talents. From Park Ji-hu’s commanding lead performance as Nam On-jo to the menacing presence of Yoo In-soo as Gwi-nam, each role contributes to the series’ intense exploration of survival, loyalty, and moral complexity under extreme circumstances. Season 2 promises to evolve the surviving characters and introduce new performers while retaining the core cast that audiences have come to recognize.

For viewers interested in exploring related content, the Criminal Minds Season 18 – Release Date Cast Episodes Guide offers insights into another long-running series with ensemble cast dynamics. Similarly, the Cast of Riviera (TV Series) – Every Major Actor and Role provides comparable information for those interested in international drama casts.

Frequently Asked Questions