Jin/Sun not married in flash-sideways (F-S)?
I’m not a genius on how Korean’s do last names (‘cept they put ’em first) … but, when Jin was getting in trouble for not declaring money, etc., they called her Ms. Paik. Granted, I’ve yet to watch the Lighthouse (last away game for my son) … but is it possible? OR is she super businessy-like important and just kept her maiden name?

it didnt come up in lighthouse, but next week is called Sundown, so it might be a Sun episode. Maybe they are not married yet, i feel like we will find out next week
Yeah, they put them first… they also don’t change them when they get married.
I think that since they were travelling together in the same way they were when the plane crashed it’s safe to say that they’re still married. I think the difference is that it’s Jin who is thinking of running instead of Sun, and that’s why he had all that money with him.
Hey- I looked it up next week next week is a Sayid episode.
But, to answer you question it is quite possible they are not married.
The reason JIn had all that money i perhaps because he wanted to start a new life in US with Sun like in the previous timeline? Although saying that, there was no allusion to mass amounts of cash in the main timeline