According to Freud's interpretation of dreams, dreams are the realization of wishes. However, it is absurd to explain your dream from this angle, because no one wants his father to die of lung cancer, so it can be ruled out that your father is not a dream. According to your narrative analysis, you want to get more attention from your favorite opposite sex in your heart or unconsciously, so your favorite opposite sex is the main body of this dream, and your father's lung cancer is just the carrier, which can make your wish come true, that is to say, you subconsciously think that your father's cancer is enough for you. I wonder if you can understand this explanation.
Note: The choice of operators is also inevitable. Why are fathers associated with cancer? I can't explain this to you because I don't know what happened in your life.
Analysis: You still care about the opposite sex you like and hope to get his/her concern.