Huh? Underage? Who? Huh?
SPOILERS*
So basically it's her older sister that died and Shinju was forced to live as her so no one would find out, that's why her mother never took her out or got her teeth fixed because they could have found out. That's also why they thought she was stupid and did bad at school but she was just much younger, that's why her IQ jumped because she was growing up.









Wait so everyone has to beat the game individually? So even if Bada cleared the game Youngtaek and the others will be trapped till they clear it by themselfes?
I don't think so since cleared maps don't reappear. But no one actually know how to escape or if escape is even possible. They just clear maps and unlock endings hoping doing one or the other will let them get out.