They have the same screenwriter and corrupt lawyer female lead in both. Also the action is another common feature together with fight against corrupt people.
Joseon era, gender hiding, comedy are the common features. Also, flowers, trees, beautiful view, beautiful dresses, same or similar palace gives the audience similar vibes.
It seems both dramas represent same period in history. Also, never ending throne war is a common point. My Country gives me same vibes as Scarlet Heart Ryeo.