bean317

Actually Prince Uiseong is a lot like the King. His mother helped him to get the throne, he watched his brother die and did nothing. He regrets it now and tries to select the Crown Prince fairly, but still he wanted the crown more than anything. It's understandable why Uiseong is the way he is, he's the firstborn and he feels excluded and overshadowed.

This storyline is so obvious they don't even bother to hide spoilers. At least we don't know what will happen to the villains, those actors never post anything.

They already spoiled that Seongnam will be the Crown Prince. One of the actresses posted a behind the scenes picture of him in the black Crown Prince attire. Unless it was from a costume fitting and all of the princes tried it on, they spoiled the whole ending.

The news headlines in the show say he studied in the US. In interviews they said he was born in Korea.

https://korepo.com/archives/1209888

Actually Prince Uiseong is smart and has many skills, we just haven't seen his full potential yet. He's cunning and he gets away with things. He's the dangerous one as it said in the last episode.

I think it's predictable that GP Seongnam will become the CP. I wish there was more suspense and more real competition to make the show more interesting. This nobody is as good as Seongnam thing is boring. We barely see other princes.

She's affraid, if she really didn't expect that CP will die so fast she's in danger now. She wants to become the Queen and make her son the CP, it's her main goal. He maybe in love with her, but I think she only uses him. She even manipulates her own son and fuels his anger towards his brothers. I don't know, I just don't think it makes sense for her character to be in love with him.

I agree that this affair happened after Prince Uiseong was born, I believe that he is the King's son. She just wanted to get Physician Kwon on her side to use him in the future. She told her father that they need Royal Physician on their side.

In the first episode when his mother punished him, you can tell that there's more to his character than just a bad guy/villain, he was hurt. He is more complex and interesting. His mother makes him act the way he does. Other princes have loving mothers and they all so nice and his treats him more strict, this difference is part of story. It's all about mothers.

She is too ambitious, she comes from an influential family and wants the best. She may be seduced him to get him on her side, but I doubt it's more than that. Her future is not bright in that case. And Chani always plays important characters, there must be something special about Prince Uiseong that will impact the story.

They showed him checking her pulse, she came to him for an exam. Why would she risk her life for that guy when she had all the chances to become the Queen?

But he is cold because his mother raised him that way. Their relationship is what I want to see the most in the future.

I don't think so. Consort Hwang was already pregnant by the King when they started an affair. And you can be executed for it.

Interview with the cast of Miracle in Japanese
https://news.kstyle.com/article.ksn?articleNo=2204221

Greetings from the cast
https://www.youtube.com/watch?v=8rSn1mYh1s4&t=1s

The character's description says that Prince Uiseong is Consort Hwang's eldest son. He has a sibling we haven't seen yet. I don't know if translations I've seen are correct.
This is an original from tvN.
https://ibb.co/kHcKYN6
https://twitter.com/CJnDrama/status/1582620889635749888?t=SOD_4jfKfNSCCIpz4eJozQ&s=19

I don't think Uiseong is an idiot. His character described as very smart and excellent at many things, including martial arts. It's obvious that he is not afraid to talk trash about the Queen even after being punished by his mother. It seems he just likes to annoy Prince Seongnam. His character promises to be interesting. And he also has a Grandfather, whom we've seen very little so far.

I expect interesting character development for Prince Uiseong in the future episodes. His relationship with his mother is very different from other princes. Wonder how much she influences him.

Prince Seong Nam grew up, or temporarily lived outside of the Palace in Seochon, for some reason. And since his other brothers are younger than him they probably didn't know him. And when he returned he was new to them. That's why the Crown Prince called him their ''new older brother''. The Crown Prince himself lives in another place, not with them, so Seong Nam is the oldest after him. I hope I got it right.

Or he does it out of boredom, out of curiosity, he just seems more delicate and sensitive by nature. The life of royals is pretty boring.

Here is trailer with English subtitles that explains every character - https://www.youtube.com/watch?v=OYAfQ7CrT4k&t=5s
And here's characters chart in Korean - https://kisskh.at/photos/qmBrK_3