I am so enjoying this series - and have been able to keep up from the accidental time travel back for Soon (the meteor shower before the tunnel) to who is who thus far. I don't think that Soon intentionally traveled back but that it happened and that he found himself 10 years earlier in time. The acting is so amazing that you can see and FEEL the love between the 2 leads both younger and older. The age gap didn't bother me - I know so many couples gay and straight with large age gaps. But there feelings and emotions say it all. One can tell that they belong together. And that's all that matters.
I am looking forward to continuing watching this even though I am crying during every episode. I have been good thus far and not looked at any spoilers but if there is one thing we all know - it's that destiny (or fate) will not be denied. I am sure it will end as it is supposed to and with a lot more tears to come.
On an aside, think a minute about yourself accidentally going back in time - would you change anything???