I can't see it ending well

Even if he finds the evidence he still have cancer, Jung will go to America, Gook Soo to Seul and Ji Na will move too, so how is it going to end?
Ok, Ji Na's father is not that evil and I like Young Cheol 'kindness' (finally I learned his name)

One thing that I'm always curious is... What the heck are that black and white star of Gook Soo, I know it's for bad and good things but what for?