New MBC drama 'Undercover High School' unveils dramatic character posters of Seo Kang Jun, Jin Ki Joo, & Kim Shin Rok

First, Seo Kang Jun shows off his strut as the new transfer studentJung Hae Sungin his character poster.

Lastly, Kim Shin Rok takes on the role ofSeo Myung Joo, an observer who watches over everything.

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