- Lim Soo-jung
- Yoon-jung / So-eun
- Jo Jung-suk
- Ji-hwan
- Lee Jin-wook
- Gun-woo
- Jung Jin-young
- Detective Kang
- Lee Ki-woo
- Detective Lee
- On Joo-Wan
- Teacher Park
- Lee Tae-ri
- Kang Seung-bum
- Jeong Woong-in
- Kang Hyeong-chul
- Jeon Sin-hwan
- Biology Teacher
- Park Ah-sung
- Science lab male student
- Kim Bo-ra
- Choi Hyun-joo
- Shin Chi-young
- Seokyung High School male teacher #1
- Won Choi
- Seokyung High School male teacher #3
- Han Hee-Jung
- Present pickpocket woman
- Kim Ji-hoon
- Counseling center detective #2
- Kim Jung-woo
- Counseling center detective #3
- Kim Kwang-hyeon
- Teacher of Misung Highschool
- Lim Young-woo
- Geon-woo's wallet pickpocket
