Okay.  Sun was in a "flash forward" showing her as one of the Oceanic 6.  When she was calling out for her husband Jin - it was only because of the great pain she was in due to the labor and the drugs they gave her for pain.  Jin was in a "flashback" when he was buying the panda.  His flashback was to show how he had changed into a loving husband since being on the island and juxtaposed it to how he was a henchman for Sun's father early in their marriage.  Did you notice his angry outburst after his taxi was hijacked with the panda inside and his cell phone was destroyed? You could also tell the cell phone was an old model because of its size.  He used to be angry and violent and it helped explain why Sun had the affair.  I don't think we'll find out how he died until later in the series.  But, now we know that Sun, Hurley, Aaron, Kate, Jack and (?) are the Oceanic 6.  I tend not to think that Ben is the 6th one because he wasn't a survivor of the plane crash.  I think the 6th will the one in the coffin and we may not find out who for awhile yet.  Since the death of the person in the coffin caused Jack to consider suicide, it must be a huge reveal. 

Hope this clears some confusion.  I am only obsessed with this show and have never missed it.