Spoiler & rant

Oh thank you. But why did the red hair royal(emperor's brother) forgot about his son? I understand Estrella's case though.

True true but it will be revealed soon, why and how it happened ╮(￣▽￣)╭
The past and everything, don't worry, the things I posted are also facts ٩(๑❛ᴗ❛๑)۶

I actually don't quite remembered about this but I think it relates to the hatred from the past diamond jeweled bearer. I hope I'm making sense, sorry if bad English
⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄
The past diamond bearer hated the royal so much, and that's why the emperor brother, red hair guy don't know he had a son. It's like a wish from the past diamond bearer. He does not want to be in a royal family if he got reborn.

Is the diamond eyes same with the caged prince who was abused

And ahmm what does jubar mean? Is it about the aerti something clan or the jewel eyes?

If this is true... Why doesn't he has the Jubar Triats... As what the guy who has fire something power... Jubar is a person with kind soul. Even though other people can hurt them the jubar will choose to kill theirselves to save them from their rage. Meaning they will have not ill intentions... if the red guy is a Jubar.. he will not have bad intentions like hurting Estrella... so why he is acting like a jerk?

I don't know anymore since I am looking for the novel... to get some info...

Also if he has luck... don't ya think he won't suffer since he has plenty of luck? Meaning he should've not suffered and live a life because of his luck... then I am confused...

MAJOR SPOILER: (read at your own risk)
Actually, he doesn't know he had a son. He likes to "sleep around" a lot with prostis and that's how Isaac was conceived. (IDK if they'll put this in the manwha. Manwha tend to cut bad stuff.) He also drinks a potion that makes him impotent whenever he does the deed so he expected the union won't bear fruit. After he met Isaac, he kept denying he's his son but the previous bearer of the diamond confirmed it to him. Then he took 5 tests to confirm it and all came out positive!

MAJOR SPOILER: (read at your own risk)
From what I read, the jewel eyes get to choose their own bearer, and they choose based on their previous owner's last feelings.
1. Diamond chose Isaac because the previous owner was imprisoned in the castle his whole life. He died hating the royal family and wished/longed to be outside away from them. Isaac being a royal + outside of the royal family is perfect. Ironically, coz of luck, Isaac got the blue jewels and will be brought to the palace the diamond hates.
2. Ruby chose Ignis fire spirit because the previous owner died hating all the humans.

The problem is only little is known about the diamond bearer. He was imprisoned so not much is known about how his power works or activated. Isaac also new to this power doesn't really know how to activate it. Maybe he's doing it unconsciously when he found the blue jewels.

Np (⌒▽⌒)

I forgot. The reason why Ignis (Red guy) acts like a jerk and hurts humans is because when he absorbed the red jewels, he also absorbed the hatred for humans the previous owner of the red jewels had. He was consumed with that hatred that he acts like a jerk.

I want to thank you Raine for explaining
ε=ε=(ノ≧∇≦)ノ
I'm not good in remembering all details so yeah, what Raine type is basically what's going on. A gist of it & still a lot of to be unfold later in the story. So, yeah (●'◡'●)ﾉ

Ignis is a name of a Harvest God on a Game Animal Parade... But if that happens that is Okay but I hope he gets punished to doing bad towards Estrella... she is special for have the Start's Power... Her divinity is definitely more powerful than Isaac... I hope my darling Baby Estrella will be okay and not suffer anymore...