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Chan-mi transfers to her twin brother's school to find out the truth about his suicide.
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
Jin Ho-eun
Sa Joong-kyung
Yeon Oh
Lim Seung-woo
Ok Jin-uk
Ma Nak Joon
