At Eighteen

Top Cast

Ong Seong-wu as Choi Joon-Woo
Kim Hyang-gi as Yoo Soo-Bin
Shin Seung-ho as Ma Whi-Young
Kang Ki-young as Oh Han-Kyeol
Shim Yi Young as Joon-Woo's mother
Kim Sun-young as Soo-Bin's mother
Choi Jae-woong as Choi Myeong-jun
Moon Bin as Jung Oh-je
Jung Young-ju as Park Geum-ja
Jung Hyeon-jun as Choi Joon-Woo (young)

Seasons

Season 1 (2019)

A misunderstood loner is drawn out of his shell after transferring to another high school, where he comes across new ordeals -- and first love.

Episodes:

Ep. 1: The Nameless Kid, Choe Jun-u (2019-07-22)

Not long after arriving at a new high school, where he's shown around by star student Ma Hwi-yeong, Choe Jun-u faces an unfair accusation.
Ep. 2: A Moment I Want to Run Away (2019-07-23)

Jun-u prepares to transfer schools again. Yu Su-bin doesn't believe Jun-u took the watch. Hwi-yeong won't own up to what he did.
Ep. 3: It Always Rains on a Sad Day (2019-07-29)

Jun-u beats out Hwi-yeong to pair up with Su-bin for a class assignment, and receives an urgent call about an old friend.
Ep. 4: Happiness and Sadness Come and Go Instantly (2019-07-30)

Su-bin and Jun-u continue practicing their English for the upcoming evaluation. Sin Jeong-hu writes a letter, and makes a heartfelt apology.
Ep. 5: After that Long and Sad Day (2019-08-05)

Jun-u's outburst of rage panics Hwi-yeong, who has something to cover up. O Han-kyeol visits someone who can testify to the truth.
Ep. 6: The Timing of Action and Reaction (2019-08-06)

Fighting with her mother, Su-bin doesn't go home. Determined to reveal Hwi-yeong's true nature, Jun-u starts to gain insight into his behavior.
Ep. 7: Romeo and Juliet (2019-08-12)

Su-bin and Jun-u can't stop thinking about each other -- but don't know what to do about it. Hwi-yeong agonizes over one wrong answer on a math test.
Ep. 8: The Moment of Your First Love (2019-08-13)

Even as Su-bin learns she's not the only one who likes Jun-u, she's excited for their first date. Jo Sang-hun goes up against Hwi-yeong's parents.
Ep. 9: I'm Sorry (2019-08-19)

Hwi-yeong sends Su-bin something that cuts her date with Jun-u short. Han-kyeol turns away a bribe. Yun Song-hui searches for a driver.
Ep. 10: The Night That Will Never Return (2019-08-20)

When the class goes on a trip together, the students bring with them a tangled mess of relationship and personal dramas.
Ep. 11: The Emotions That I Got to Know Through You (2019-08-26)

Han-kyeol deals with a petition to replace him. Hwi-yeong removes Su-bin from the tutor group, which bothers Song-hui more than it does her.
Ep. 12: Being More Mature Than Adults at the Age of 18 (2019-08-27)

A rumor about Hwi-yeong's grades being rigged spreads like wildfire. Su-bin hesitates to tell Song-hui something, and meets with her father.
Ep. 13: I Should Still Like You (2019-09-02)

Finals approach, Song-hui's disapproval forces Su-bin and Jun-u apart, and Han-kyeol tracks down Hwi-yeong's old teacher.
Ep. 14: Happy Birthday to You (2019-09-03)

Everyone worries when the rumor about Hwi-yeong gets him into real trouble. Jun-u tells Han-kyeol about his newfound goal.
Ep. 15: Ways to Embrace Your Scar (2019-09-09)

Song-hui remains stubborn about Su-bin and Jun-u, who enters an art academy. The school board investigates Hwi-yeong's case.
Ep. 16: This Goodbye Isn't Forever (2019-09-10)

Hwi-yeong makes peace with the others -- and himself. Jun-u realizes his mother's situation, and must break difficult news to Su-bin.