Ditto

Kim Ha-neul

as

Yoon So-eun

Yoo Ji-tae

as

Ji-in

Ha Ji-won

as

Soe Hyeon-ji

Park Yong-woo

as

Ji Dong-hee

Shin Cheol-jin

as

Security Guard

Yoo Tae-gyun

as

Yoon So-eun's ...

Lee In-ok

as

Yoon So-eun's ...

Lee Yeong-gwang

as

Professor

Kim Sang-won

as

Ji-in's Friend

Kim Do-yoon

as

Ham Radio Club...

Lee Kyung-Hoon

as

Literature Clu...

Kim Min-joo

as

Hur Sun-mi

Maeng Bong-hak

as

Doctor

Kim Bang-Sun

as

Librarian

Kim Do-sik

as

Butler