In Chapter 7 , the senior demon chef, named Bing, apologizes to his younger brother, Ming, for not revealing his identity earlier. Ming apologizes for not showing his true identity earlier, but Bing assures him that Ming will not be angry with him for hiding his identity. Ming asks Bing to take the gift of the green wind gem as a token of his gratitude. Ming explains that the gem is a symbol of the wind god, and the blade is made of green wind gold. The moaning wind gem allows Ming to cast spells faster, and his faster slices will cut through even when he uses it for his amazing blade works. Ming says that he cannot accept the knife because it is a treasure from his family, and he asks Bing if he wants to sell it to Ming at what price.