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.
My Annoying Brother
Strobe Edge
The Great Magician
Perfect World
All Summers End
Samjin Company English Class
Troll Factory
First Kiss
Puff: Wonders of the Reef
The Silenced
Dear Ex
Sunny
A Year-End Medley
The Beauty Inside
Psychokinesis
Love Exposure
Time to Hunt
Donkey Skin
The Mermaid
Your Eyes Tell
Doh Kyung-sooBeom-sil
Kim So-hyunSoo-ok
Yeon Jun-seokSan-dol
David LeeGae-deok
Joo Ah-reumGil-ja
