Haechi (2019)

Both dramas are : mystery/thriller/romance/investigation/palace politics/strangling for power/corrupted officials trying to overthrow the prince from his position/suspense/action.

In both dramas the prince is smart and kindhearted but he's constantly threatened by corrupted politicians whom want to kill him.
In both dramas the female lead tries to save the prince and together they uncover murders and secret organizations that try to overthrow the monarchy.
In both dramas the main leads fall in love slowly in the process and not instantly. The romance is mature , deep and meaningful.
Female lead in both dramas is a capable warrior, she knows how to fight, handles a sword better than most men , is smart and cunning and deeply in love with the prince.
Both dramas focus in the "fight between Good and Evil" .
Both dramas have this dark cinematography theme similar to thrillers, include deaths and tragic scenes were good people get sacrificed and killed for the power hungry royals. Haechi is more serious and tragic. Our blooming youth is more focused on the romance.

Even though, they are fairly different (one is a cdrama, wuxia with fantastical elements and Haechi is a sageuk), the male lead has a "similar" treatment. Many times he is misjudged but has really good intentions. Maybe if you liked The untamed, Give a try to this one, because you will meet many characters and every one will remain in your heart. Also bromance.

Both are historical dramas with strong female leads. You end up loving the main characters as well as the side characters and feel invested in their stories. The pacing in both is fast and you are hooked. Also, SO MUCH BROMANCE.

Although Haechi is a bit darker, both dramas involve the fight for the throne, they have strong female leads, comedy, romance, and a great story that keeps you clicking the next episode.

- both are historical dramas.
- they both has a current king and another potential king.
- the lead female helps the lead male in his journey.

Haechi is about how twisted the political condition in Joseon Dynasty. On the other side, Six Flying Dragons consist of 50 episodes, from the journey how Goryeo Dynasty become Joseon till all the civil war that happen. Both are heavy historical political drama and have good actors.

Both shows involve half brothers fighting on opposite sides. Both showcase a strong female lead. In both, the Male Lead start without a goal, but an incident causes them to grow and become more responsible. The Male Leads also become a leader to their respective teams.

This is the parent story of this drama. Watching Dong Yi first will make you understand the plot of Haechi a little better. Haechi was still good on its own though and the plot was definitely different from Dong Yi.

Haechi is also about one of the greatest King in history like The Great King Sejong. However, the later is a very detailed and sometimes boring recount of Sejongs childhood to when he became King as well as his accomplishments. I liked it because it was a truthful recount. Haechi is about Yeongjo childhood to when he became King, it doesn't delve into much detail on what he accomplished and thus this drama was more dramatic and entertaining.

Haechi and Under the Queen's Umbrella are both Korean historical dramas whose plot revolves around the fight for succession among the king's sons and an overlooked prince's unlikely climb to the position of crown prince.

That said, in Haechi the person who eventually becomes the crown prince is the protagonist of the drama, whereas in Under the Queen's Umbrella the main character is actually his mother. For that reason, the dramas emphasise different aspects of the selection process. Also, in Haechi the crown prince arc is only one part of the story, which follows the protagonist into his reign as king, whereas in UQU I think the crown prince selection will take up the majority of the narrative.

That said, if you like the intrigues and plotting in either drama, you may enjoy that aspect of the other.

In Both Dramas:

---Male lead is a kind, highly intelligent and calculating prince who has learned to hide his true personality behind a carefree facade since the true "ruler" of the country is only corrupt officials
---Male lead tries to support the innocent younger 4th brother of the family and help him success the throne, instead of the evil 2nd brother.
---Male and Female lead join forces and try to uncover corrupted officials and expose the crimes of the 2nd (evil) brother. Second brother does anything in order to steal the throne, including numerous murders.
---Both dramas have a lot of action scenes combined with interesting palace politics ( I never got bored not even for a second) and romance.
---Both dramas have a good amount of Romance . Female leads are smart , kind and fight for justice and to protect their loved ones.
---The side characters have interesting back story and are all well written. This adds a lot to the "world building".
---Male lead despite being a Prince, he never cares about obtaining the throne. He only wants to protect the younger Prince from the evil older Prince whom desperately tries to win the throne.

Differences:
Well... Haechi is K-drama not Chinese and is dark but not as dark and sad as Rise of the phoenixes was. Rise of the phoenixes was very very tragic.
Haechi has a lot of sad moments but there are also many times that the main leads will manage to succeed! Rise of the phoenixes also was more focused on politics. Haechi has more action scenes and more romance (without to forget the politics aspect).

Both dramas are serious and focus on how important it is in life to be kind and fight for justice. Good against Evil. Love against all forces. Those are the morale of the story.

Both of these dramas are historical dramas that involve succession to the throne. Haechi and The Red Sleeve are based on family members. Both dramas have strong and smart female leads. The male leads are dunning as well.

During the Joseon Dynasty, a young woman named Hong Chun Ki is a painter – a true rarity in Joseon Korea, where Confucian values dictate that such pursuits are unsuitable for a woman. She was born blind but somehow managed to acquire a sense of vision. And now she has been accepted to the most prestigious art college in the land. One day, she meets Ha Ram, an astrologer whose fate is the polar opposite of her own: Although he was born sighted, he lost his vision in a childhood accident. Regardless, he is also in possession of an astounding talent that allows him to read the future by tracing the movement of the sky at night despite the fact that he is blind. The duo is sucked into the machinations of the royal court, particularly those involving two princes, the free-spirited Prince Yang Myung and the cruel, scheming Prince Joo Hyang – a man who longs to become the next Joseon king.

•Jung Il Woo takes the role of the main character in both drama, proving he can play both a commoner and a royal
•Secrets, palace and common life intrigues, injustice.
• moody historical drama with beautiful cinematography and OST

Both are heavy political dramas and have a Crown Prince as ML. Both crown princes are very similar and want to be good kings who really care for people. Haechi has more action while Secret Door is more psychological. One thing to keep in mind is that the 2nd male lead in Secret Door is also the main character in Haechi. Both characters and dramas are based on true story. Obviously each drama tells its own version about personality of this prince (and later King).