Duty After School

Duty After School is a 2023 South Korean coming-of-age military sci-fi television series created by Lee Nam-gyu, written by Yoon Soo and directed by Sung Yong-il. The series stars an ensemble cast including Shin Hyun-soo, Lee Soon-won, Im Se-mi, Kwon Eun-bin, Kim Ki-hae, Kim Min-chul (actor), Kim So-hee, Kim Su-gyeom, Kim Jung-lan, Moon Sang-min, Shin Myung-sung, Shin Su-hyun, Shin Hye-ji, Ahn Da-eun, Ahn Do-gyu, Yeo Joo-ha, Oh Se-eun, Woo Min-gyu, Yoon Jong-bin (actor), Lee Yeon, Ji Min-hyuk, Choi Moon-hee, Hong Sa-bin, and Hwang Se-in. Based on the webtoon of the same name by Ha Il-kwon, in which later serialized on Naver Webtoon, tells the story of a "purple object" that appears in the skies around the world and attacks humans, so students become cadets and fight against the strange creatures. It aired from March 31 to April 21, 2023, on TVING's Fridays at 16:00 (KST). It is also available for streaming on Viu and Viki in selected regions.

The series was divided into two parts: Part 1 aired on March 31, 2023, and Part 2 aired on April 21, 2023.

Synopsis
Duty After School tells the story of the seniors students at Sungjin High School as they are conscripted to fight against the attack of a group of mysterious creatures that have covered the sky.

Main

 * Shin Hyun-soo as Lee Chun-ho
 * A lieutenant and platoon commander of Class 3–2. He is initially firm with the students but warms up to them and cares for them more than anyone else.


 * Lee Soon-won as Kim Won-bin
 * A sergeant who is a faithful assistant to Chun-ho. Though he is 21 years old, he looks much older so he is teased by the students for his looks.


 * Im Se-mi as Park Eun-young
 * The homeroom teacher of Class 3–2 who prioritizes the students' safety.


 * Kwon Eun-bin as Yeon Bo-ra
 * A student of Class 3–2 with a frank and hot-tempered personality. Though she helps others, she frequently bullies Ae-seol.


 * Kim Ki-hae as Kim Chi-yeol
 * A student of Class 3–2. He is introverted and has no special dreams or desired colleges. Although seemingly timid, he takes the lead at times in rescuing his friends. He has a crush on Na-ra.


 * Kim Min-chul (actor) as Do Soo-cheol
 * A student of Class 3–2. He is best friends with Woo-taek and has a crush also on Na-ra.


 * Kim So-hee as Lee Soon-yi
 * A student of Class 3–2. She is a timid and soft-hearted personality.


 * Kim Su-gyeom as Kwon Il-ha
 * A troublemaker student of Class 3–2 who does whatever he wants. He bullies Yeong-hun and later Yeong-su.


 * Kim Jung-lan as Park So-yoon
 * A student of Class 3–2.


 * Moon Sang-min as Wang Tae-man
 * The mood maker student of Class 3–2.


 * Shin Myung-sung as Im Woo-taek
 * A student in Class 3–2. He is best friends with Soo-chul.


 * Shin Su-hyun as Cha So-yeon
 * A student of Class 3–2. She has a crush on Chun-ho, the platoon commander.


 * Shin Hye-ji as Choi Yeon-ju
 * A student of Class 3-2. She shows an unexpected wit in the midst of war with her kind and altruistic personality who silently takes care of her friends.


 * Ahn Da-eun as Kim In-hye
 * A student of Class 3–2.


 * Ahn Do-gyu as Kook Young-soo
 * A student of Class 3–2 who creates a conflict with his classmates with his selfish appearance of worrying about his safety even at a time of crisis as a 'shop-obsessed man' who thinks that every minute and every second other than studying is a luxury. He is bullied by Il-ha.


 * Yeo Joo-ha as Kim Yu-jung
 * The class president of Class 3–2. She tries to make rational decisions even in confusing situations.


 * Oh Se-eun as Hong Jun-hee
 * The 'professional complainer' student of Class 3–2. She is selfish and stubborn and becomes a tension factor in the war.


 * Woo Min-gyu as Kim Duk-joong
 * A military virtuoso of Class 3–2 and someone who likes to eat.


 * Yoon Jong-bin (actor) as Jo Jang-soo
 * The vice-president of Class 3–2. He is courageous and takes after his father, who is a soldier.


 * Lee Yeon as No Ae-seol
 * A student of Class 3–2 who is quiet and often bullied by Bo-ra. She is slower at her tasks and sometimes messes things up but has a good nature.


 * Ji Min-hyuk as Jo Young-sin
 * A student of Class 3–2. He can escape crises by calmly and quickly grasping the situation.


 * Choi Moon-hee as Lee Na-ra
 * A student of Class 3–2. She is quiet and appears cool. She also excels at her tasks and is the sharpshooter of the team.


 * Hong Sa-bin as Woo Hee-rak
 * The last rank student of Class 3–2.


 * Hwang Se-in as Yu Ha-na
 * A student of Class 3–2. She is timid and cries easily. She listens Bo-ra and sticks to her for support.

Supporting

 * Noh Jong-hyun as Jang Young-hoon
 * A student of Class 3–2. He is focused on studies and appears to have no interest in making friends. He is bullied by Il-ha.


 * Lee Jung-min as Seo Ja-yoon, the platoon instructor of Class 3–2.

Special appearance

 * Shim So-young as Young-soo's mother
 * Park Jung-yeon as Yoon-seo
 * A high school girl who survived in the attic.


 * Park Jin-soo as Ji-min as a student survivor
 * Yoo Jun as Jae-won as a student survivor
 * Kim Do-yeon as Deok-joong's mother

Development
Studio Dragon together with director Sung Yong-il, who directed Class of Lies (2019), and writer Lee Nam-gyu, who wrote The Light in Your Eyes (2019), produced the popular webtoon Duty After School (webtoon) into a drama. Production has begun with the goal of broadcasting in 2022.

According to Bloter, the series was scheduled to be included as TVING's original content and Studio Dragon considered the possibility that it would be included as a Netflix original series.

Casting
Shin Hyun-woo and Hwang Se-in confirmed their appearance for the series in August and October 2021, respectively.

In February 2023, the cast lineup and the release date of the series were revealed.

Filming
Principal photography began in August 2021 and ended in March 2022.

Release
On March 8, 2023, it was reported that the first three episodes will release at once on the 31st.

On March 30, 2023, it was announced that Duty After School would be divided into two parts. Part 1 with the first six episodes was released on March 30, 2023, while Part 2 with the remaining three episodes was released on April 21, 2023.