One spirit, who was determined to be fooled no longer, thought about the problem seriously. After deep contemplation, he came up with a cunning plan that would surely allow him to capture Dong Bangsak once and for all. As it happened, Dong Bangsak was one day passing over the Tancheon. There, he came upon someone washing clothes in the stream water with a piece of charcoal. It was the spirit disguised as a human. Unable to resist this unusual sight, Dong Bang-sak asked, “Why are you using that charcoal to wash your clothes?”