
there might be some part that i explained poorly cause english is not my first language. So i will apologize hha
i just wanted to write it so badly cause the plot is so confusing and i finally get the hang of it. In middle of the writing i thought the answer Rose was searching for might be the singes who looks like her. But after thinking it might be the third prince of the neighbor country. Cause if it was the singer third prince wouldn't need to be involved. But from the start of season 2 third prince first appeared in front of the Rose so...

You were almost right about everything except for the last paragraph you wrote.
Karnan (the prince from another country), he isn't a descendant of gold, he's just the prince of a country where magic can be used, he wanted to become the emperor there and make his country an empire. I doubt he knows who gold is except for the fact that the ml is "blessed" by gold. If anyone is a descendant of gold it would be Lucien (ml's right hand man) since he is probably a descendant of the baby Anya (Gold) sent away in the water.

His original plan was to make an empire, Anya (Gold) was just supposed to validate his reason for doing it. Anya left her village because she felt trapped and with Ranon she could see the world for what it truly was. Ranon brough Anya with him because she is a "goddess" and with her just being with him regardless of if she could actually use magic or not made him at least seem like he had a reason for taking over the other kingdoms.
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Goddes - Gold(ronan's wife)
Ronan loved her so dearly to make him hate his own child. And the children's despised their mother cause they were weak in every aspect and hated by the people so much and started badmouthing the queen. So he made the second wish to make their child be exeptional. But it comes with price as sacrificing their loved ones. So gold slowly hated him. But he couldn't do anything about it cause he doesn't want his wife to die by their children's hand cause of the destiny god has bestowed. And it became curse in every generation and gold has to pick the blessed one thousend years. In those thousend years ronan became ghost too. If he doesn't lose his reasoning the god promised the way out for end of his wife suffering. So he's just hanging there searching for it and met Rose.
Ml fell in love with Rose when they were children. And after seeing her long time after he couldn't let her go cause of his vassal's word that said most safe place will be beside him who is holy being(the vassal is protecter of justice and every generation he helps those loved ones and being there for them when they are suffering)
Ml becames blessed one cause his brother resemles the first king too much the Gold chose the our Ml be the one. If blessed one dies the blessing will transfer to the older brother so gold trying her best not to make him die. She doing what she can do, but she can't defy the destiny either. So gold told Rose to not tell anything about sacrifice has made.
Ml being traumatized cause if he loves the Rose until the end she will die cause it's too late to not love her anymore. And guilt has been eating him from the inside cause every bas thing happening is because of him.
And season 2 is about they finding the answer and put ease to Ml's mind. So there is no ghost trope at the moment cause they are not taking place in imperial palace. And if my guess is right the third prince from neighbor country is descendant of the goddess too. He's different looking from their brothers(more handsome and scheming hhe) and he's has very big desire to be king. He is something to do with ritual that take place in Gold's birth village and the third child of the Gold. The box they opened when they do the ritual, there were white shining ball. And the sparkle went into the cloth he was wrapped.