While Angry Mom and God's Gift - 14 Days don't sound similar in synopsis, the feel of these dramas is very similar. Both of them have a plot that delves into corruption and how it trickles down into society and has an effect on everyone. With both dramas, you get the feeling that there is a lot happening behind the scenes. Also, both feature a mother having to resort to desperate measures to protect her daughter.
Both dramas were written by the same writer. I saw a lot of similarities in the characters. The male lead had somehow similar characteristics. They were rude and rough, although this characteristic did made them humorous characters. Also, some people think that the female lead from Black and God's Gift were annoying. In addition to this, both involves struggles with the government/ people with great power. Also, the place of incident in both were in Moojin.