In Our Prime
A genius mathematician with a hidden past and a needy student given up on math.
Ji-woo, an outcast at a prestigious private school, meets Hak-sung, the school janitor who is actually a mathematical genius who defected from North Korea.
Cast
Choi Min-sikRi Hak-sung 
Kim Dong-hwiHan Ji-woo 
Park Hae-joonAhn Gi-chul 
Park Byung-eunKim Geun-ho 
Jo Yoon-seoPark Bo-ram 
Tang Joon-sangTae-yeon 
Kim Won-haePark Pil-joo 
Ju Jin-moProfessor Oh 
Kim Hee-jungBo-ram's Mother 
Kang Mal-geumJi-woo's Mother 
Joo Ye-rinKorean Teacher 
Jung Seung-kilNIS Agent 
Shin Jae-whiStudent 5 
Kang Jun-kyuUi-joon 
Kim So-sukPrincipal 
Choi Jae-supHanbok Teacher
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