To take a shortcut, my girlfriend drove into a tunnel that wasn't marked on any map. But even after driving for thirty minutes, we still couldn't see the exit. I clearly remembered that the distance between the two mountains was no more than 700 meters. How could we possibly drive for over thirty minutes without reaching the other end? Just as we were wondering what was going on, we suddenly spotted another car ahead. It turned out someone else was lost in the tunnel too. And so, our journey to find the exit began.