A friend of mine asked me, "What is so special about your work (thesis writing)?" I told him, "What factors drive bank choice is not a new research area but little work has been done related to shariah compliance among Muslims. To simplify that, my research focuses the human behavior for the benefits of human, while others (in the same research area) tend to be institution-oriented."
This uniqueness is also called as 'research gap'. There must be some reasons before you start conducting certain research. What is so special? Why should you do that? Is it a real problem? These are all questions that you should justify. I still remember my guru's (Professor Dr. Muhammad Syukri Salleh) analogy when defining the 'problem statement'. Just like when you decide to choose someone to be your wife. You have to tell your parents that this girl is bla, bla,bla....... (reasons, right?). In the end, you tell them how unique she is.