Faceless Love is the official remake of Rich Man Poor Woman. The original drama is really good especially the bonding of First and Second male leads.
Double Savage and Romantic Blue are similar because of the brothers rivalry theme. In both dramas the situation makes the big brother a criminal.
Both of the series belongs to the same universe. Middleman's Love has the story of Uea's best friend and co worker Jade. It is also light and fluffy drama to watch anyday.