1 – Manan High School
Episodes 1–7 (total 7 episodes). As the first case of the Teacher Rights Protection Bureau, it deals with what happens to Kim Kyungmin, a 1st-year outcast student and witness to the incident, starting from the suicide of Park Daeseok, a 2nd-year outcast student, in a school where the creation and neglect of “complete outcasts” (organized isolation bullying) was left unchecked.

2 – Guun High-Tech High School
Episodes 8–15 (total 8 episodes). Set in Guun High-Tech High School, where a ranking system and group fights exist, it deals with the events between Kim Hyungju and Jang Kwonhyuk.

3 – Soyeon Girls’ High School
Episodes 16–21 (total 6 episodes). In Soyeon Girls’ High School, where a culture of ignoring teachers exists, it begins with teacher Go Youngsoo making a wrong choice and deals with the events between teacher Jung Sunyoung and Han Yeri. This is the episode where Im Hanlim acts as a substitute for Na Hwajin and is the first to take charge of a school; this episode leads into the following Chukmyeong High School arc.

4 – Chukmyeong High School
Episodes 22–27 (total 6 episodes). Deals with teachers who infringe on students’ right to education and with Choi Hyunwoong, who becomes the new target of teacher Cheon Sangyeol, who had a major influence on Han Yeri going down the wrong path.

5 – Hyunjin Middle School
Episodes 28–34 (total 7 episodes). Deals with juvenile offenders under the age of 14. A notable feature is that characters who were imprisoned in a juvenile detention center in the Blue String universe appear together.

6 – Seungyeon High School
Episodes 35–41 (total 7 episodes). Deals with seniority-based hazing in sports teams and a coach taking money. In this arc, Im Hanlim steps in instead of Na Hwajin.

7 – Shillabyeol Elementary School
Episodes 42–46 (total 5 episodes). Deals with feminist indoctrination education by a teacher.

8 – Child Abuse
Episodes 47–54 (total 8 episodes). The first episode set outside public education. It deals with child abuse, and because the victim is an infant/toddler attending daycare, the Teacher Rights Protection Bureau cannot legally intervene.

9 – Gangyeong High School
Episodes 54–63 (total 10 episodes). Deals with group bullying and lenient punishment. However, unlike the first episode that focused on group bullying, this one centers more on the lenient punishment.

10 – Helper
Episodes 63–72 (total 10 episodes). Deals with “helpers” who use runaway youths to commit crimes. In this episode, Han Yeri becomes active for the first time.

11 – Island Village
Episodes 72–81 (total 10 episodes). Deals with incidents occurring in a closed society. Although it may not seem directly related to teacher rights, there is justification for the Bureau’s intervention because students’ right to education is violated due to group ostracism led by local residents against outsiders, and teachers from outside are also unable to properly exercise their right to teach. Among these, the teacher’s rights issue is treated as particularly important within the work.

12 – Hyeonjung Elementary School
Episodes 81–90. Deals with abuse of power by parents.

13 – Juvenile Illegal Gambling and Mugging
Episodes 90–101. Deals with illegal gambling by minors and mugging, one of the “three major trash crimes.”

14 – Cult Religion
Episodes 101–110. Deals with indoctrination education by a cult. This is the final episode of Season 1.

15 – Compilation
Episode 111. Deals with the aftermath of past perpetrators and victims and concludes Season 1.

16 – School Violence Idol Arc
Episodes 112–118. Deals with celebrity school violence exposés. The “boss battle” incident occurs right before this arc.

17 – Brass Knuckle Assault
Episodes 118–124. Appears to be based on a real middle school male student brass knuckle assault case in Jeonju.

18 – Reverse Discrimination in Multicultural Families (Canceled)
Started from Episode 125 but was discontinued and deleted due to controversy over the use of a racial slur; it was replaced with the ADHD medication arc.

18 – Exam-Oriented Education Arc
Episodes 125–130. Deals with ADHD medication being taken by students as a “study-enhancing drug.”

19 – Dowon Gyeongdang Arc
Started from Episode 131. Deals with corruption, harmful practices, and school violence occurring in a traditional academy called Dowon Gyeongdang.

20 – Juvenile Gangsters Arc
Episode 139. Deals with minors who fall into fantasies about gangs, get tattoos, join organizations, and commit gang-related crimes.

21 – SNS Live Assault Arc
Begins in the latter half of Episode 148. Two middle school girls obsessed with views and likes brutally assault a peer to create more attention-grabbing content.

22 – Rental Apartment Discrimination Arc
Begins in the latter half of Episode 155. Re-examines real incidents from a Seoul apartment complex involving discrimination against rental apartment residents.

23 – Contract Teacher Rights Violation Arc
Begins in the latter half of Episode 163. Based on a real case in Changwon where a contract teacher was confined, verbally abused, and assaulted. The arc begins when Im Hanlim kicks the perpetrator in the face after witnessing the abuse while on break.

24 – Ministry of Education Official Abuse of Power Arc
Begins in the latter half of Episode 169. Starts when an official tries to handle his son’s school matters; the biggest issue lies with the perpetrator Lee Hyunjong. In the end, both Ahn Sunmyeong and the now-repentant official fall together.

25 – School Violence Counter-Accusation Arc
Begins from Episode 177. Starts when Yoo Jeongtaek and Kim Giryong report each other to the Bureau; in Episode 180, Kim Giryong is revealed to be the final perpetrator and is exposed by Gu Sera.

26 – Gyojo Challenge Arc
Begins in the latter half of Episode 183. The previously quiet group G.Y resumes activity, and the entire Bureau responds by counter-challenging them.

27 – Absent Lawyer Arc
Begins from Episode 191. Starts with a victim’s bereaved family protesting in front of the Bureau. Choi Kangseok invites them in, and Na Hwajin recommends Lee Junbin, leading to a trial. The judge also plays a role in bringing down the absent lawyer, and the arc concludes with Ok Seoyoung, Kim Yuni, and Lee Dabin (those responsible for a school violence-related death) falling together.

28 – Bureau Impersonation Arc
Begins from Episode 205. Deals with the side effects of private retaliation and false accusations. Concludes in Episode 213 with the perpetrator Song Hansol apologizing to the victim.