Two Mothers (2014)

Both dramas have family pressuring couple into having a baby but they can’t so they end up having to hire a surrogate mother.

Both have strong female characters. In both dramas the female lead are also mothers who endure a lot and fight for the sake of their child.

The grandmother in both are similar: Both on the father's side, bullying of the female lead and favouring the grandson.

the same main female actress
both are about women who are betrayed by their husband