Revenge of Others

Cast

Shin Ye-eun plays Ok Chan-mi, the twin sister of Ok Chan-kyu who transfers to Yong-Tan High School to find his murderer because she does not believe he committed suicide. Lomon portrays Ji Soo-heon, a suffering student in Class 3 who needs money and helps bullied students take revenge on their bullies by beating them up for payment. Seo Ji-hoon appears as Seok Jae-beom, a student of Class 4 from a wealthy family who recently woke up from a six-month coma, has lost all his memories, and must resit the year as a senior. Chae Sang-woo plays Gi Oh-sung, the manipulative class president of Class 4 who was Jae-beom's friend before Jae-beom lost his memories and tries to help him recover them; he is the primary antagonist.

Lee Soo-min is Kuk Ji-hyun, Gi Oh-sung's stepsister. Chung Su-bin plays Tae So-yeon, an albino girl. Yeon-oh appears as Im Seung-woo. Wooyeon portrays Hong Ah-jeong, Park Won-seok's girlfriend.

Kang Yeol plays Ok Chan-kyu, also known as Park Won-seok, Ok Chan-mi's twin brother who died. Jin Ho-eun is Sa Jung-gyeong, a bully who sexually assaulted Seon-ha when they were previously in the same photography club. Hwang Bo-un appears as Seo Da-yeon. Ahn Hyun-ho plays Min Seon-ha, a victim of bullying who was sexually assaulted by Jung-kyung in the photography club.

Moon Ye-jin portrays Park Na-rin, Kuk Ji-hyeon's friend who often gets involved in school events and hates Gi Oh-sung. Kim Joo-ryoung plays Jin So-jeong, a detective who investigated Park Won-seok's death. Jang Hyun-sung appears as Gi Wang-do, Chief of Yongtan Police Station and Gi Oh-sung's father. Shin Su-ho plays Hyun Jong-kook.

Kim Do-yeon is Ahn Ji-won. Seo Hye-rin portrays Yang Hye-jeong, Kuk Ji-hyeon's mother. Kang Yi-seok plays Kwon Se-jin. Yoon Jin-sung appears as Shin Yu-kyung, Ji Soo-heon's mother.