I read in STAR magazine (i know, it's a tabloid, so who knows) that only 2 of the 3 raft people survive. I have a feeling they're going to kill Jin off, because then they can explore Sun's relationship with Michael. I know that when they were casting the show, Yun Jin Kim originally was up for the role of Kate. They didn't think she was right for that role but liked her so much they wrote the part of Sun for her, and Daniel Dae Kim has said he got his job 'cause they wanted Sun to be married. So, if the makers of the show value her more (and who knows if they do), I would think Jin is more dispensable. That would make me sad. I like him.