It was actually the duke who killed Jonas. The duke knew all along that Jonas isnt his biological son but since his second wife adored Jonas, he went with the flow. Growing up, Jonas became too greedy. He wanted more power and actually planned to revolt and steal the crown from the royal family, even to the extend that he is willing to kill the Duke and the second wife (yeah, talk about an ungrateful bastard). The Duke learned this as decided its best to silence Jonas to protect the royal family and he also didnt want his beloved second wife to know this and be broken hearted so he staged everything about Jonas dying in sickness or whatever (〜￣△￣)〜
It was actually the duke who killed Jonas. The duke knew all along that Jonas isnt his biological son but since his second wife adored Jonas, he went with the flow. Growing up, Jonas became too greedy. He wanted more power and actually planned to revolt and steal the crown from the royal family, even to the extend that he is willing to kill the Duke and the second wife (yeah, talk about an ungrateful bastard). The Duke learned this as decided its best to silence Jonas to protect the royal family and he also didnt want his beloved second wife to know this and be broken hearted so he staged everything about Jonas dying in sickness or whatever (〜￣△￣)〜