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.
도경수
as Beom-sil
김소현
as Soo-ok
Yeon Jun-seok
as San-dol
이다윗
as Gae-deok
주아름
as Gil-ja
박해준
as Min-ho
김지호
as Gil-ja
박용우
as Hyung-joon
이대연
as Su-ok's Father
황석정
as Gae-deok's Mother
박정민
as Yong-su
이범수
as Young-chul
