They are both written by the same writer. In both dramas the female lead is very rich and a bit quirky.

Both dramas are written by the same writer. The female leads are both a bit quirky and the stories are both about unlikely romances.

Both stories feature a young single mother who live in a small town. But how each story story plays out they differ from each other.

In both series there are lovers that are separated then are reunited.
There are other similarities that are spoilers for both series.