Revenge of Others

A boy falls to his death at school, but Ok Chan-mi does not believe that her twin brother, Park Won-seok, committed suicide. Chan-mi transfers to her brother's school, Yongtan High, and meets Ji Soo-heon, who witnessed her brother's death. A "hero," who avenges bullied students, appears at Yongtan High. Chan-mi speculates that it may be connected to her brother and starts looking for this hero.

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  Shin Ye-eunOk Chan-mi
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  LomonJi Soo-heon
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  Seo Ji-hoonSeok Jae-beom
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  Chae Sang-wooKi Oh-seong
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  Lee Soo-minGook Ji-hyun
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  Chung Su-binTae So-yeon
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  Kim Joo-ryoungJin So-jeong
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  WooyeonHong Ah-jung
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  Jin Ho-eunSa Joong-kyung
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  Yeon OhLim Seung-woo