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Park Bo-young

as

Se-Hee

Joo Won

as

Joon-Hyuk

Kang Byul

as

Jung-Mi

Kim Min-hyuk

as

Detective Kim

Lee Marg-Eum

as

girl

Kang Hae-In

as

cutie

Kwon Nam-hee

as

girl's mother

Jeong Dong-gyoo

as

Se-Hee's father

Choi Ji-Hun

as

Ji-Hun

Nam Kyung-eup

as

Detective Jang

Min Young

as

homeroom teach...

Han Ye-Na

as

teacher (uncre...