Hwa-Jin Na’s teaching techniques are pretty violent for someone who works in the Ministry of Education. That being said, when punishments don't seem to work on even the worst of school bullies, there is no better man for the job. Sometimes you can’t get a good education until those bullies are taught a lesson.
 
(Source: WEBTOON, edited)
 
Note: Belongs to Blue String universe.

Note: Belongs to Blue String universe.

What happens when the scariest kid in school asks you out on a date? Yoojung struggles to survive what may just be the worst day of her life.
 
(Source: YLAB)
 
Note: Belongs to Blue String universe.

Tired of being picked on, Yeongha, the new transfer student, decides to fight back… and discovers he can pack a punch. He soon becomes the top of the food chain, savoring his new title as the toughest guy at school. But he meets his match when Suho Kang, the Champion of the PVP games, single-handedly takes down him and his crew. To earn back his honor, Yeongha decides to join the PVP games. Will he finally get the satisfaction of beating Suho up? Or will he gain something more?
 
(Source: WEBTOON)
 
Notes: 
- Includes one extra chapter. 
- Belongs to Blue String universe.

Nicknamed the “school for future criminals,” Yusung Technical High School isn’t exactly the ideal place to study. A rarity among his peers, Gamin is a student with just one goal: to get into university. At a school where it’s every man for himself, he is rejected from countless study groups before he decides to form his own. When Hankyeong, Gamin’s former tutor, joins his high school in hopes of earning her teacher certification, it seems like they’re both reaching for the impossible. Can they defeat the odds and achieve their dreams?
 
(Source: WEBTOON)
 
Note: Belongs to Blue String universe.

A high school student, Im Da-Joon is used to being bullied at school. Right before he was about to end his own life, he saw the interview of a friend killer on TV by chance. He got impressed by the interview and decided to seek revenge. His revenge was successful, but his life went in the wrong direction… Im Da-Joon quit school and joined the group of teenagers who ran away from their homes. Da-Joon is now free from school bullies, but now he has to survive against the street gangs who are much tougher than school bullies.
 
(Source: YLAB)
 
Note: Belongs to Blue String universe.

Seulgi was no.1 in her old suburban school. Now, having transferred to the prestigious Chaehwa Girls’ High in Seoul, she must engage in fierce, friendly competition with her rich and talented rival Jay.
 
(Source: YLAB)
 
Note: - Belongs to Blue String universe. 
- includes one extra chapter.

I found someone who looks exactly like me on SNS! He seems to have everything unlike me who grew up in an orphanage. Maybe he could be my twin?! When I was about to find him and solve my life problems, I got into huge trouble!!
 
(Source: YLAB)
 
Note: Belongs to Blue String universe.

Geon-U Dan has vowed to overthrow the status quo of the dysfunctional high school he recently transferred to, where rich and powerful third-generation chaebol heirs call the shots and gambling runs rampant. But does Geon-U have what it takes to beat the odds, defeat the Taekyeong Oh Family, and restore law and order to his high school?
 
(Source: WEBTOON, edited) 
Notes: 
- Includes one extra chapter. 
- Belongs to Blue String universe.

Juyeong is in a juvenile detention center for the attempted murder of his father, Gang-ryong. He clings to hope, dreaming of a future in Seoul with his childhood friend, Dayeon. But everything shatters when Dayeon is tragically killed by a rogue truck, and the devastation deepens when Juyeong learns that his father was behind the wheel. In a cruel twist, Gang-ryong regains consciousness and offers Juyeong an ultimatum: “If you want revenge, become the king of this detention center!” Now, Juyeong must navigate the treacherous world of prison politics, determined to rise to power and avenge his friend. (Source: WEBTOON)

Im Da-Jun became the leader of the runaway family after being kicked out of his house. Yeon-Woo, who he took in by chance, ends up in a knife assault in Yeonsu-gu, Incheon. The one who stopped Yeon-Woo from getting his revenge against the chaebol chairman was Yun Ga-Min, whose dream is to become a good student. Meanwhile, Na Hwa-Jin takes an interest and watches over them...
 
(Source: Naver, translated)
 
Note: Belongs to Blue String universe.

At Kangsan High School, one of the nation's most troubled schools, Gu Se-Ra is the top student. Her childhood crush, her older boarder, Lee Seo-Jun, comes to Kangsan High School for a teaching internship, and she experiences numerous hardships with the troubled students. To protect her crush, Gu Se-Ra resolves to transform this troubled school into a model one. (Source: Naver, translated)

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