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So you know, hiding wounds in the apocalypse isn't a good idea unless you're hiding them from a monster that's trying to kill you, no? But there's no point in hiding them from your own team, right?
Exactly. The thing is, Lee Soo Hyuk, Choi Jung Soo and Kim Rok Soo were idiots, even worse, idiots with a high tolerance for pain.
At first they tried to find a solution using the number system of that famous little board, only to discover that their "1" was a "3" for normal people and their "5" was a "10", modifying it didn't help much either. They then opted for a triangle question system, Jung Soo would ask Soo Hyuk if he was okay, Soo Hyuk would ask the same to Rok Soo and Rok Soo would hit Jung Soo to see if he was writhing in pain or not.
Well, it worked. The rest is history.