A teen outsider becomes manager of a secretive app revealing schoolmates' secrets. Joining the popular clique, she develops a romance with a seemingly perfect heartthrob hiding his own secret.
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Kim Wooseok
Kang U Bin
Kang Na-eon
Kim Ji Eun
Son Dong-pyo
Mo Bong Gu
Choi Geon
Lee Dong Min
Chae Rin Han
Min Seol Hui
Lee Jin-woo
Kim Soo-hwan
