Ditto

Kim Ha-neul

Yoon So-eun

Yoo Ji-tae

Ji-in

Ha Ji-won

Soe Hyeon-ji

Park Yong-woo

Ji Dong-hee

Kim Min-joo

Hur Sun-mi

Shin Cheol-jin

Security Guard

Yoo Tae-gyun

Yoon So-eun's Father

Lee In-ok

Yoon So-eun's Mother

Lee Yeong-gwang

Professor

Kim Sang-won

Ji-in's Friend

Kong Yu-seok

Ji-in's Friend

Yoo Jin-hee

Hospital lady

Maeng Bong-hak

Doctor

Kim Do-sik

Butler

Kim Bang-sun

Librarian

Kim Do-yoon

Ham Radio Club 1

Son Kang-gook

Ham Radio Club 2

Lee Kyung-hoon

Literature Club 3

Lee Seung-chan

Literature Club 4