It is obvious that we acknowledge the existence of complex number in mathematics.  However, we still have no clues about authentic natural essences of complex number from our current mathematic systems. Complex number is an ironic wall to restrict what human can see authentic faces of mathematics from its nature. In the other way, complex number is a symbol that helps implementing the difficult gaps in order to give a completion picture of its journey in mathematics, and reveals a short path as a bridge for connecting between the invisible world and the real world. (T.V.)