Maou

Both dramas are stories of revenge. The series surrounds the fulfillment of revenge for a beloved person who died violently when the main characters were younger. The stories' conclusions are reminiscent of each other. Ikuta Toma also stars in both dramas.

They are both revenge dramas. It is pretty much the same story, only with a female main lead.

it's the Japanese version of this drama,

Ikuta Toma & Ohno Satoshi stars in this dark, mystery & psychological thriller drama. Remake of Korean drama Lucifer/Devil/Mawang stars Joo Ji Hoon. Definitely a must watch if you like this genre.

The story concept is practically identical and the characters in both are amazing.

Both are revenge dramas. Though the premises are different.
Both are decent dramas.
Black revenge deals with scandals however maou has investigation and detective setup.

- Brother's death
- masterminds solving mysteries
- In Mad Dog, little brother looks for his big brother's death and in Maou it is the other way around

In both series we ask ourselves if the main character is either good or bad. As the action advances we discover his reasons for being like that.

both dramas deal with a hidden revenge, emotional interesting plot and great cast, oh and two arashi members

Suzukura Mana is an aspiring designer at an apparel company. Mana has worked hard as an assistant and is well within reach of her dream of making her debut as a designer, but she has a secret that she cannot tell anyone. In fact, she killed her husband, who was abusive to her on a daily basis, in order to achieve the peaceful life she has today. Then, suddenly, the husband she thought she had killed appears in front of Mana, with no memory of it, and they end up living together. And as Mana spends time with her "murdered husband," she comes into contact with a warmer side of her husband that she had never known before. But then, a shocking truth is revealed.

both dramas are full of suspense and feature antihero characters as well as an intriguing story line and a plot that lets you guessing

Ikuta Toma & Ohno Satoshi stars in this dark, mystery & psychological thriller drama. Remake of Korean drama Lucifer stars Joo Ji Hoon. Definitely a must watch if you like this genre.

Both of the dramas are suspense and have detective elements in it. Also, the main actor - Ikuta Toma. Maou has more emotional intensity and Majo Saiban has more intensity in terms of "I have no idea what's happening here".

Both dramas has the same revenge vibes.
The detective-killer relationship has deep roots in the past.
All the story is really sad and violent.

Both protagonists are very smart, come back with different names and plot a revenge against all people who crossed their ways.