Both dramas centers on marriage and the heroine's desire of domesticity.

In both dramas, the leads work as news anchor. We see them in their work place in most of the drama and can have a glimpse of how things work in this field.

One drama is a comedy/romance while the other is more of a drama with some comedy and romance.

The two drama show the struggle of a Crown Prince who has to deal with court intrigue.
The Crwon Prince/King has to deal with an "impossible" love in both case.

Both movies deal with cases of bullying at school which lead to tragic events. Both have an emphasis on the victim's families quest for truth.

The movie and the drama depict how a young woman is going to lose weight in order to get what she deserves.

In both the dramas, the female lead changes from an ugly duckling to a beautiful swan. The women are strong willed and confident which also contributes to attract the male lead.

Both show undercover cops loosing themselves in their new identity. Also, the line between right and wrong is blurred for the undercover as well as for the spectator.

Both dramas depict the lives of 30+ urban people who are looking for love while managing their every day life.

Both dramas display a cat & mouse chase. The killings taking place are linked to the main character

In both movies, a conspiracy is taking place to dethrone the king. There is more action in Curse of the Golden Flower though.

Both movies are period movies and the action is taking place in the palace where ploting is rampant.

Both are historical dramas set during the Joseon era. In both movies, the main character is brought into the palace because of his talent and thus involved into the court dramas.

Also both movies are based on real life events.