Jonas (Luca's Biological Father) is not the son of Duke Winterwald. Jonas mother, Princess Venessa have slept with someone (the novel didn't indicate who it is).
Jonas died because the Duke hired an assassin for him. The Duke only cared and loved Sophie, so when ge learned that Jonas planned to kill Sophie, because of his greed for power and money, the Duke didn't hesitate to kill Jonas.
Sophie and Princess Venessa, are best of friends. There were times that may or may not portrayed that Sophie is inlove with Princess Venessa (She's so dedicated to the princess, to the point that it makes me so confused with her feelings for Princess Venessa).
Major Spoiler:
Luca has reinarnated as well as Judith. In Judith's case, she not only transmigrated but she also reincarnated...
In her first life, Judith is the same Judith who abused Luca because of her inferiority Complex. When she died because of Franz scheme (The Villain), she transmigrated to Korea and probably read a novel which have a striking resemblance with her first life (Jokes on you, but its her past memory playing in her mind). When she died on her second life, she reincarnated again on her first Life.
In their First Life, Luca completely understood why her aunt is acting that way.
Also in their first life, when Judith sends off Luca to the Winterwald, she shift her hatred to the Winterwald, so she asks for help to Franz (the villain) for revenge. Unfortunately she died from Franz scheme, which Luca regrets. He deeply regrets losing his one and closest blood related family. He knew that his uncle/ML didn't love him, he only respects his bloodline and is only loyal because of his lineage. As I said in the spoilers before, he was not related to his uncle, nor the duchess and the duke.
Ps. Judith tried to rekindled or somewhat felt sorry for Luca in their Last life, thats why instead of hating Luca she shifted his hatred to the Winterwald in their last life.
Read at your own risk!!
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Eudith or Judith is related to the previous King. So she's a royal. The previous king have a sister whom he loves so dearly to the point that it suffocating her. Her sister (Judith's Grandmother) fell inlove with a commoner. The previous king opposed their relationship due to the differences of their status, so her sister ran away and married that commoner (Another Spoiler: She fell inlove because of his looks). So yeah, Judith came from a royal lineage, and Sophie (Duchess Winterwald) probably knew that she's from a royal lineage because of her eyes. Having a purple or light purple eyes are rare and only the royal lineage has it.
Just leave a comment if you want another major spoiler.