Lee Hee Seung

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Park Jong Seong

(Jay Park)

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Sim Jae Yun

(Jake Sim)

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Park Sunghoon

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Kim Seon Woo

(Sunoo)

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Yang Jung Won

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Nishimura Riki

(Ni-ki)

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Park Chae-Yeong

(Portrayed by Kim So-hyun)

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(Sorry I couldn't find a clearer picture of Jake)