Overview
Dong-ho is ranked number 1 in "Arena," an illegal gambling league for teens, but he steps down to prepare for college. However, the members of "Arena" don't want to lose their biggest money-maker, so they place a debt on his brother Dong-min. Dong-min literally fights against his debt, but when he gets hurt, Dong-ho decides to fight back.
| Actor | Age then | Age now | |
|---|---|---|---|
 | 25 | 31 | |
 | 22 | 28 | |
 | 26 | 32 | |
 | 23 | 29 | |
| 26 | 32 | |
 | 26 | 33 | |
| 24 | 30 | |
 | 23 | 29 |