What is grit?  Grit has been defined by researchers in slightly different but consistent ways.  It is hard work plus dedication, perseverance and persistence in the face of adversity, passion for long term goals

general practitioner Wee Teong Boo

in the very beginning, we have great doubts on the case and as it progressed, we could see that it did not tally.
there are so many things unexplained which we could not find the right answer.