Su-bin and Jun-u continue practicing their English for the upcoming evaluation. Sin Jeong-hu writes a letter, and makes a heartfelt apology.
| Title | At Eighteen - Season 1 Episode 4 Happiness and Sadness Come and Go Instantly |
|---|---|
| Year | 2019 |
| Genre | Drama, Comedy |
| Country | South Korea |
| Studio | JTBC |
| Cast | Ong Seong-wu, Kim Hyang-gi, Shin Seung-ho, Kang Ki-young, Sim Yi-young, Kim Sun-young |
| Crew | Yun Gyeong-a (Writer), Sim Na-yeon (Director) |
| Alternative Titles | Moment of Eighteen, เพราะเธอคือรักแรก, Moment at Eighteen, 18 Moments, Moment of Eighteen |
| Keyword | love triangle, high school, romance, coming of age, school, first love, high school rivalry, teen drama, heartfelt, romantic drama, hardworking male lead, shy male lead, romantic |
| First Air Date | Jul 22, 2019 |
| Last Air date | Sep 10, 2019 |
| Season | 1 Season |
| Episode | 16 Episode |
| Runtime | 70:14 minutes |
| Quality | HD |
| IMDb: | 6.30/ 10 by 18.00 users |
| Popularity | 22.671 |
| Language | Korean |
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