Gong Yoo as Kang In-ho

Jung Yu-mi as Seo Yoo-jin

Kim Hyun-soo as Kim Yeon-doo

Jung In-seo as Jin Yoo-ri

Baek Seung-hwan as Jeon Min-soo

Jang Gwang as Principal / Principal's Brother

Kim Joo-ryoung as Yoon Ja-ae

Kim Min-sang as Park Bo-hyeon

Lim Hyun-sung as Young-hoon

Jeon Kuk-hwan as Attorney Hwang

Choi Jin-ho as Prosecutor

Kwon Hong-suk as Judge

Uhm Hyo-seop as Police Officer Jang

Park Hye-jin as Principal's Wife

Kim Ji-young as In-ho's Mother

Kim Ji-young as Sol-yi

Uhm Ji-sung as Young-soo

Lee Sang-hee as Auto Repair Shop Owner

Nam Myung-ryeol as Professor Kim Jung-woo

Park Kyoung-hee as Hostess 2

Jang So-yeon as Courtroom Sign Language Interpreter

Hong Seok-yeon as School Custodian

Heo Jae-ho as Broadcasting Station PD

Jung Hyung-suk as Publishing Company Employee