 Yang Ik-juneJung Jong-suk (voice) | Jung Jong-suk (voice) |
 Oh Jung-seHwang Kyung-min (voice) | Hwang Kyung-min (voice) |
 Kim Hye-naKim Chul (voice) | Kim Chul (voice) |
 Park Hee-vonYoung Hwang Kyung-min (voice) | Young Hwang Kyung-min (voice) |
 Kim Kkob-biYoung Jung Jong-suk / Female Karaoke Employee (voice) | Young Jung Jong-suk / Female Karaoke Employee (voice) |
| JJo Yeong-BinKang-min (voice) | Kang-min (voice) |
 Heo Ji-woongDetective #1 (voice) | Detective #1 (voice) |
 Kyung-soonJong-suk's Mother (voice) | Jong-suk's Mother (voice) |
| LLee Don-yongKyeong-min's Father (voice) | Kyeong-min's Father (voice) |
| HHan Hyeon-minAhn Jeong-hee (voice) | Ahn Jeong-hee (voice) |
| LLee Jae HyungSon Seok-eung / Cheol-i's Father (voice) | Son Seok-eung / Cheol-i's Father (voice) |
| HHan Yoon-seoJong-seok's Older Sister / Dog Owner (voice) | Jong-seok's Older Sister / Dog Owner (voice) |
| LLee Soo-hyeonPark Chan-yeong (voice) | Park Chan-yeong (voice) |
 Jung In-giPublishing Company Director (voice) | Publishing Company Director (voice) |
 Kim Jae-rokHome Room Teacher (voice) | Home Room Teacher (voice) |
| KKim Sung-hyunGym Teacher (voice) | Gym Teacher (voice) |
| JJang Hyo-jinRecord Shop Owner (voice) | Record Shop Owner (voice) |
 Yeon Sang-hoLee Jeong-min / Cat / Kim Yeong Message Center / School students (voice) | Lee Jeong-min / Cat / Kim Yeong Message Center / School students (voice) |
| LLee Joo-yeongCheol-i's Mother (voice) | Cheol-i's Mother (voice) |
| CChoi Gyoo-seokDetective #2 (voice) | Detective #2 (voice) |
| Kyung-soonJong-seok's Mother (voice) | Jong-seok's Mother (voice) |
| JJo Yeong-gakJong-seok's Father / School student (voice) | Jong-seok's Father / School student (voice) |
| HHa Myeong-seokMale Karaoke Employee / School student (voice) | Male Karaoke Employee / School student (voice) |
 Choi Ri-hoCorruption detective team leader (voice) | Corruption detective team leader (voice) |
