In the first part of a trilogy on When Death Comes Knocking, CNA's Vanessa Lim meets cancer patient Afif Yusli, who fought back from being unable to speak and walk - only to be dealt what some might see as the worst hand of all. SINGAPORE: Meeting Afif Yusli for the first time, it's not immediately obvious that he's sick, let alone battling a terminal disease. The lean 27-year-old moves around nimbly, with no obvious signs of pain or discomfort. And unlike what some might expect of a cancer