Characters played by Gong Yoo
Kang In-ho
Characters played by Yu-mi Jung
Seo Yoo-jin
Characters played by Hyeon-soo Kim
Kim Yeon-doo
Characters played by Jee-Young Kim
In-ho's grandmother
Characters played by In-seo Jeong
Jin Yoo-ri
Characters played by Seung-hwan Baek
Jeon Min-soo
Characters played by Hye-jin Park
Headmaster's Wife
Characters played by Jang Gwang
Principal
Principal's Brother
Characters played by Ji-seong Eom
Young-soo
Characters played by Jeon Gook-hwan
Attorney Hwang
Characters played by Jae-Ho Heo
Broadcasting Station PD
Characters played by Seok-yeon Hong
School Custodian
Guard
Characters played by Eom Hyo-Seob
Police Officer Jang
Characters played by Kim Ji-young
Sol-yi
Characters played by Choi Jin-ho
Prosecutor
Characters played by Kim Joo-Ryung
Yoon Ja-ae
Characters played by Min-Sang Kim
Park Bo-hyun
Characters played by Hyun-sung Lim
Young-Hoon
Characters played by Myung-Ryul Nam
Professor Kim Jung-woo
Characters played by Jang So-yeon
Courtroom Sign Language Interpreter
Characters played by Kwon Yoo-Jin
Judge