Ceng Mei Hao (曾美好) is Wang Da Dong's mother. She is a loving housewife, during in her younger years she was known as "Dao Gui" (刀鬼); an infamous weapon inventor and a powerful assassin. All terrorists in the world sought to buy her weapons and devices to their advantage. During her time as an inventor, she had created over thousands of special weapons with different functions and effects, such as Su Huan Needle.