School

Da In struggles to adapt to Dongkwang High School after transferring from an alternative school.

As part of efforts to become a model school, Gye Nam initiates the School Guardians Campaign.

Following unreasonable physical punishment against Se Chan, Seok Ju mobilizes the entire class to boycott.

Da In tries to help Yu Jin by being her friend. Meanwhile, a misunderstanding leads some girls to bully Da In.

Yu Jin is happy as other girls suddenly treat her as their friend. Da In becomes the "super outcast."

Da In discovers why the girls have been mean to her, and Won Seok realizes that he wronged Seok Ju.

Jun Hee's past is revealed, and upon recognizing her as his former tutee, Jae Hyun endeavors to help her.

Jun Hee tells Jae Hyun that she loves him. Jae Hyun, who had only thought of her as a student, feels confused.

With planning the school trip, long-standing gender conflicts escalate, leading to tensions among the students.

Even during the school trip, the ongoing gender role conflict persists, giving Yi Kyung some challenges.

The college entrance system changes so often that the students and the teachers both have a hard time.

Won Seok feels frustrated as he cannot get higher scores on his tests, regardless of how hard he studies.

Young Eun's classmates and teachers initiate fundraising when it's revealed that her mom is sick.

Seok Ju starts dating Seo Kyung from the electrical crafting club, who looks much like his first love.

Bok Man arranges an after-school marathon club, but the three bottom students are the only applicants.

Amidst rampant rumors that Jae Hyun and Jun Hee are dating, their love deepens even further.

Bok Man gives students in Division 11-5 homework, which is to write an introduction about their friends.

A female student has a baby in the school's bathroom. Da In, whose mother's a single mother, is affected.

Some new teachers, including a new homeroom teacher for Division 11-5, come to the school.

During the exam season, students are sensitive about their grades and ranks, and strange happenings occur.

Many students refuse to take makeup classes during the vacation. Some teachers are also against them.

Dal Sik and Na Young spend 100 days together dating, and they prepare for a special celebration.

Upon learning of the school's new hairstyle regulations, students decide to confront the school.

As the anniversary of his old friend Min Kyu's passing draws near, Se Chan finds himself battling insomnia.

The school demands the students to sign a form stating that they are aware of Hong Geun's mental illness.