Legend has it that a long time ago, when Pangu opened the world, he accidentally opened the door to the second world. This world is called: the World of Five Elements.
It's just that this world has been forgotten by people a long time ago...
There were once five curious people who led their companions into that mysterious world, namely: Chen Lingjinzhi, Su Muqianzhi, Chen Qianshuizhi, Mu Huobinzhi, and Li Rongdizhi.