| Duration: | 7020 min |
|---|---|
| Genres: | Drama |
Ji-woo, an outcast in a private high school, does not fit in due to his different social background from his well-to-do classmates.
One day, he meets Hak-sung, the school's security guard who is actually a mathematical genius who defected from North Korea, now living with his past shut away.
Ji-woo asks Hak-sung to teach him math, and although reluctant at first, Hak-sung eventually agrees.
