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How's your navigation system?

One spring day when the autumn colors had filled, three members of the movie club suddenly decide to borrow a senior's car and take a trip to an isolated village in Mountain Nae-jang. Being their first trip there, they get lost a little and witness a terrible accident and they pick up a navigation device nearby. The kind voice on the device leads them to their destination but they end up somewhere they never expected. They decide to take a break and find a piece of flat stone to grill some meat on but they realize the stone was a gravestone and hurriedly run away in their car. Their tragedy starts when someone jumps out from nowhere and is hit by their car