In Our Prime

“A genius mathematician with a hidden past and a needy student given up on math.”

At a prestigious private school in Seoul, Han Ji-woo (Kim Dong-hwi) is an outcast who is failing math. The janitor, Ri Hak-sung (Choi Min-sik), turns out to be a mathematical genius who defected from North Korea, and he has kept that past hidden. Park Dong-hun follows the odd lessons that start between them, and Ji-woo begins to lean on a man who cannot afford to be known.