Short: The major difference between this and most romance stories is that this one covers two time periods, when they first meet, how it doesn't work, and how they meet later in life. Brilliantly told and performed by the cast with lovely music throughout.

Detailed:
One of the main things that attracted me to this drama (other than the fabulous Lee Bo Young) was that this told not only the love story of how the couple meet but also the later story of how they meet again later in life, how their lives have become so completely different because of the events that have happened to them in the intervening time. Values that were held strong in youth are cast aside and almost turned on their head by the older versions, but are the same two people still in there, and is there a future for them?

So many romance stories show the couple meeting and coming together and that's your happy ending, but this one gives you a taste of the 90's with some great music and scenes from the period, brings them together and then forces them apart only for them to coincidentally meet many years later. He's married, she's divorced, he's gone from anti-corporation to the vice president of one of the biggest, she's picketing outside that very same corporation against its greed.

The cast are fantastic both the older and younger pair, Yoo Ji Tae and Lee Bo Young are long time professionals and they carry their roles with all the expertise you would expect. Park Jin Young and Jeon So Nee carry the mantle of the younger counterparts and do so very well.

There's a lot to unpack as the story progresses but it doesn't rush, it's consistent and keeps a steady pace throughout so that you don't get bored, but at the same time it's not rushing it either.

Music is fantastic, some very appropriate original pieces in the sound track along with some classics from the 90's for those who remember them.

There's some really nice work in the two time periods being represented too, one that stands out for me is where the older pair go for a trip somewhere they went when they were younger. In the younger reminiscences you can see they are walking on some kind of railway platform with arches. In the later version of the scene, that platform and railway have been replaced with a road but it's clearly the same place. Really nicely done and added to that sense of the two time periods.

The story progresses both timelines side by side, showing something in the past, showing something in the present, and often using the past to explain the motivations and feelings behind things said and done in the present.

Fantastic story, definitely recommend it if you like a relaxing warm romance that's a bit different to the normal.