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.
Kim So-hyun | Su-ok | |
Do Kyung-soo | Bum-sil | |
Lee Da-wit | Gae-deok | |
Joo Da-Young | Gil-ja | |
Yeon Jun-Seok | San-dol | |
Kim Ji-ho | Gil-ja (present) |
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