Zhenwu Realm, Yuhua Sect, Xuanjing Vein.     “Clang clang clang clang!”     In the dark mine, a group of young men and women dressed in gray cloth and linen, holding pickaxes, hammers, and shovels in their foreheads, were digging hard.     The air was filled with a mixed smell of dust and ore, and sweat soaked everyone’s …