3 Months of Steel Pipe Smashing Sound... Who's Making This Sound?

Please hit the CC button for subtitles A village suffering from the endless noisy sound. The sound of hitting with a steel pipe continues day and night. It's been 3 months since the villagers couldn't sleep..! No matter how many times they looked through the allies, they couldn't find where it was coming from. Then we came across a crucial clue! Where is this sound coming from?! #WOWVideo #우와한비디오 #MysteriousSteelPipeSound