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.

Shin Ye-eun

Ok Chan-mi

Lomon

Ji Soo-heon

Seo Ji-hoon

Seok Jae-beom

Chae Sang-woo

Ki Oh-seong

Lee Soo-min

Gook Ji-hyun

Chung Su-bin

Tae So-yeon

Kim Joo-ryoung

Jin So-jeong

Wooyeon

Hong Ah-jung

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