In this endearing supernatural love story spanning two decades, a university student finds himself communicating with a female classmate from the same school through an antique ham radio.
김하늘
as Yoon So-eun
유지태
as Ji-in
하지원
as Soe Hyeon-ji
박용우
as Ji Dong-hee
신철진
as Security Guard
Yoo Tae-gyun
as Yoon So-eun's Father
이인옥
as Yoon So-eun's Mother
Lee Yeong-gwang
as Professor
Kim Sang-won
as Ji-in's Friend
Kim Do-yoon
as Ham Radio Club 1
Lee Kyung-Hoon
as Literature Club 3
Kim Min-joo
as Hur Sun-mi
