Rebel: Thief Who Stole the People (2017)

Both stories share a ML that does shady things for a living, but are sweet hearted at the same time that they would do anything to protect their loved ones even start a rebellion (like in rebel: thief who stole the people).

Also in both the king has a unstable state of mind, gets manipulated by a woman and had daddy issues...

The vive in both is really positive, the protagonists are always plotting something but for the grater good and against of the evil power.

Even one of the main songs that come from the Joseon era folklore is present in both, in one sung by a woman and in the other by a man.

Both are centered around a legendary masked heroic thief, who fights the rich and helps the poor. They are driven by revenge and a distinct sense of justice. They also have exceptionally good fighting skills. Also both involve an interesting father/son relationship as well as romance (Rebel has better romance than Iljimae imo).

However, I'd dare to say that Iljimae is a lighter watch than Rebel. Latter is more complex and involves more characters.

Both are historical Korean dramas with similar pacing and tone, with the first couple/few episodes focusing on the ML's parents before the ML grows up and becomes the focus of the story. Both MLs have superhuman strength and are feared/wanted to be killed by others. The FLs are the ML's second love, not first. Both featuring supporting characters who are courtesans and are heavily involving in the politics of the country. The villain remains largely in power/on top for the entire drama, only meeting his end in the final episode.

Both involve bringing justice for the people, and involve a bit of romance. Personally, both of the weak points in both of these dramas are the romance.

The two dramas have different dynamics. Emperor: Owner of the Mask involves the people & the palace versus the Pyungsoo group. Rebel: Thief Who Stole the People involves the rebels and the palace.

Both place the focus onto the main character who develops into a true leader.

Both dramas are about 3 siblings(two brothers and one sister) where villain destroyed their family,as result, they get separate.

Rebel: Thief who stole the people is another historical drama made by the same director of missing crown prince (Kim Jin Man)

Both dramas are about unconventional heroes trying to save the people from a corrupted king, so many twists and turns, keep you guessing what will happen next.

Similar tone, historical setting, slow pace, and interesting characters. The ML's personality also seemed similar to me.

Both dramas have and interesting and intriguing story, magnificent acting, as well as deep and growing characters, well-fitting music and beautiful cinematography.