Sady

Both dramas deal with the posh youth of Seoul.
Rich heir boy vs cinderella type girl and all the family drama all around.

These dramas are reminiscent of the Gossip Girl series.

In each drama, their is a girl with very good qualifications who ends up moving in a socially awakward -yet accomplished- man.
This living arrangement will lead to a marriage of convenience.

Set in the same time period, both dramas follows young individuals, their infatuations, love, deceptions and growing up.

In both dramas, a team is made up to catch fraudsters (taxes in 38 Task Force and insurance in Mad Dog).

Both the lead character are nutcase, also experts in their field (Accounting for Chief Kim and Law for Mr Jo) trying to take down a big firm rotten by corruption and malpractice.

Both these dramas center on spunky and sharp-tongued young girls. We also see their family dynamics and friendships.

One gets a feeling of melancholia while watching these girls going through first love and navigating through their youth during a time that's long gone.

In both dramas we follow the lead protagonist as he get's hired in a big company. It's interesting because we get a glimpse of how a Korean company works (conformism, hierarchy...)
While Jang Geu Rae is not qualified for the job ang introverted, Chief Kim is talented and extraverted.

In each drama, the lead heroine is desperatly seeking a husband.

Both dramas centers on socially awkward characters and their desire for a domestic life.

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.