This is a quality contemporary Korean romantic drama about the relationship between two co-workers consisting of a younger man and slightly older woman. Really, the difference in age is hardly an issue, but she is his senior at work, which means they must use some discretion.
This series doesn't quite reach the highs of similar series like Something In The Rain or One Spring Night, but it probably maintains a more consistent pace than both, and makes for pleasant viewing.
It wisely includes additional stories involving three other couples formed by the secondary characters in order to maintain the interest, and thankfully flashbacks are kept to a minimum.
As you'd expect from a romantic KDrama, the cast are nearly all attractive, and the acting is fine.
It distinguishes itself from the KDrama pack (like the two aforementioned series) by making all characters seem sympathetic and real. There are no goodies and baddies (except perhaps the grandfather).
This is well worth a watch if you liked other KDramas such as My Mister, Encounter, or the other two series mentioned above.