Season
- Season 1 2019-07-22
Episode
- Episode 1: The Nameless Kid, Choe Jun-u
- Episode 2: A Moment I Want to Run Away
- Episode 3: It Always Rains on a Sad Day
- Episode 4: Happiness and Sadness Come and Go Instantly
- Episode 5: After that Long and Sad Day
- Episode 6: The Timing of Action and Reaction
- Episode 7: Romeo and Juliet
- Episode 8: The Moment of Your First Love
- Episode 9: I'm Sorry
- Episode 10: The Night That Will Never Return
- Episode 11: The Emotions That I Got to Know Through You
- Episode 12: Being More Mature Than Adults at the Age of 18
- Episode 13: I Should Still Like You
- Episode 14: Happy Birthday to You
- Episode 15: Ways to Embrace Your Scar
- Episode 16: This Goodbye Isn't Forever
At Eighteen Season 1 Happy Birthday to You
A misunderstood loner is drawn out of his shell after transferring to another high school, where he comes across new ordeals -- and first love.
