Overview
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.
| Actor | Age then | Age now | |
|---|---|---|---|
 | 60 | 63 | |
 | 26 | 29 | |
 | 45 | 49 | |
 | 44 | 48 | |
 | 29 | 32 | |
 | 18 | 22 | |
 | 52 | 56 | |
 | 64 | 67 | |
 | 51 | 54 | |
 | 43 | 46 |
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