On a live music radio show, a letter arrives from the 23 years in the past. Through the letter, the first love and friendships of five friends are revealed.
20 Once Again
My Annoying Brother
Puff: Wonders of the Reef
Dear Ex
A Violent Prosecutor
Samjin Company English Class
Furious
All Summers End
The Silenced
Strobe Edge
Troll Factory
Seondal: The Man Who Sells the River
A Year-End Medley
The Beauty Inside
Psychokinesis
Love Exposure
Time to Hunt
Donkey Skin
The Mermaid
Train to Busan
