A Thousand Kisses (2011)

They both have similar love story angst. And the general theme is not too far off either.

Awesome "Senergy" between the main characters worth a rewatch

In both dramas they have some kind of twist in th story and age gap. The both have family problems and i really like both even though both have about 50 episodes, but i think it's worth to watch : )

both have some nice chemistry between the leads and you really want to root for them to get together in spite of what everyone else thinks.

The little boy is also cute (although much cuter and more adorable in A Thousand Kisses).

Secondary characters are multidimensional and get solid development relevant to the plot(s).

both dramas deal with the female lead divorcing her husband and falling in love with a guy who loved her before she divorced her husband .

Both dramas have Kim So Eun in main roles. Age gaps of an older man and younger woman and much an older woman with a younger man are deal with in both.