At Eighteen follows the story of eighteen-year-old Choi Joon-woo (Ong Seong-wu), whose teenage life has been molded by his meager family life and the conflicts he faced in school. Forced to transfer schools for a violation he did not commit, he arrives at Cheonbong High School where he has decided to be a nobody: a loner just quietly riding out 11th grade. Little does he know the twists and turns and the surprises in store for his eighteen-year-old life.
Soon, the loner inside Joon-woo has to come out of his comfort zone. Not only Joon-woo, but his fellow immature and inexperienced eighteen-year-olds, too, will have conflicts and whirlwinds of emotions and face the prejudices of a world shaped by the adults around them. Together, they have to live their lives to the max and make life-changing decisions. And most of all, they must not forget to cherish every moment of their lives. For all they know, the memories of their nineteenth year of life might be the sweetest, the most precious, and the most unforgettable.
A student of Class 2-3 who has gotten used to being lonely and is not practiced in expressing his emotions. He is forced to transfer to Cheonbong High School for a violation he did not commit and is used to being solitary at school. Being a transferee, he is an object of ridicule and prejudice from his new classmates. But as he adapts to the new environment, he becomes closer with his classmates and earns the friendship of his crush, top student Soo-bin.
A top student of Class 2-3 who has no clear goals and ambition as her life is controlled by her mother, who wants her to enroll in prestigious colleges in Seoul. Despite her opposition, she is forced to meet tutors and attend private classes and to strictly check her performance at school. She is among the few people in school who know of Joon-woo's real personality. She gradually starts to have feelings for Joon-woo.
A top student of Class 2-3 from an affluent family who seems to be courageous and strong but is suffering from a complex. He is the president of their class and is known for acing every subject in school. Unknown to everyone, he is forced by his perfectionist and physically abusive father to be the best in everything. He also has the habit of scratching his wrist when in distress. Due to this negative family life, he tends to see his peers as subordinate to him, a personality discovered by Joon-woo and their homeroom teacher Mr. Oh.
The homeroom teacher of Class 2-3. He is formerly an assistant homeroom teacher temporarily in charge of Class 2-3, whose official HT is hospitalized. After an incident at school, he asks the vice-principal for him to be promoted as the official HT of Class 2-3. He is a shopaholic and, as a teacher, is frequently nervous when dealing with challenges in the class.
Supporting
Students
Lee Seung-min as Lee Ki-tae
Class 2-3 student; So-ye's boyfriend and a part of Hwi-young's clique. He keeps himself close to Hwi-young to gain his friendship and be included in private study groups, to the extent that most would see him as Hwi-young's servant.
Class 2-3 student; Joon-woo's seatmate and best friend. He is handsome, athletic, and likes to play basketball; he is Da-heen's crush. In his family, he would help his father out by either managing their tteokbokki shop or taking care of his baby brother. It is revealed in later episodes that he is gay; he harbored a secret crush on Hwi-young.
Class 2-3 student; one of Soo-bin's friends. She has a strong crush on Oh-je.
Han Sung-min as Hwang Ro-mi
Class 2-3 student; one of Soo-bin's friends. She is jealous of Soo-bin being in the top tier. She has a crush on Joon-woo and would ignore Pil-sang's advances.
Soo-bin's mother. She forces Soo-bin to be top in class and prepare for going to an in-Seoul college. She is in bad terms with her husband Jong-soo, who has now a new woman.
Lee Hae-young as Yoo Jong-soo
Soo-bin's father. He wants to be divorced with his wife, but he loves Soo-bin as his daughter.
Jung Young-joo as Park Geum-ja
Hwi-young's mother. Spoiling her son and out of the fear of starting her husband's fury, she would use her wealth to manipulate Hwi-young's teachers.
Sung Ki-yoon as Ma Yoon-gi
Hwi-young's father. Forcing his son to be top of his class, he puts both his wife and Hwi-young through emotional abuse.
An employee at the convenience store where Joon-woo works part-time. She usually calls Joon-woo as "Park Young-bae" (the name written on the second-hand uniform Joon-woo is using at work). She is trying hard to find a better work. She is Mr. Oh's love interest.
Happiness and Sadness Come and Go Instantly (기쁨과 슬픔은 한 순간)
3.393%
4.466%
5
August 5, 2019
After That Long and Sad Day (길고 슬픈 그날 밤이 지나면)
3.341%
3.710%
6
August 6, 2019
The Timing of Action and Reaction (액션과 리액션의 타이밍)
3.512%
4.260%
7
August 12, 2019
Romeo and Juliet (로미오와 줄리엣)
3.150%
3.545%
8
August 13, 2019
The Moment of Your First Love (첫 사랑의 순간)
3.560%
4.217%
9
August 19, 2019
I'm Sorry... (미안해...)
3.322%
3.927%
10
August 20, 2019
The Night That Will Never Return (다시 못 올 그날 밤)
3.416%
4.031%
11
August 26, 2019
The Emotions That I Got To Know Through You (너로 인해 알게 된 감정들)
3.766%
5.010%
12
August 27, 2019
Being More Mature Than Adults At The Age Of 18 (어른 보다 더 어른다운 열여덟)
3.508%
4.299%
13
September 2, 2019
I Should Still Like You (계속 좋아해야지 그래도)
3.498%
4.247%
14
September 3, 2019
Happy Birthday To You
3.808%
5.019%
15
September 9, 2019
Ways to Embrace Your Scar (상처를 안아주는 방법)
3.740%
4.585%
16
September 10, 2019
This Goodbye Isn't Forever (지금의 헤어짐이 영원하지 않음을)
3.882%
4.865%
Average
3.402%
4.150%
In the table above, the blue numbers represent the lowest ratings and the red numbers represent the highest ratings.
This series aired on a cable channel/pay TV which normally has a relatively smaller audience compared to free-to-air TV/public broadcasters (KBS, SBS, MBC and EBS).
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