Cecilia is pregnant. During her pregnancy, she was quite calm, unlike Tassera, who during her pregnancy had to consume a magic item every few days or felt uncomfortable, like suffering from magic addiction, eventually consuming all the magic items collected with great effort, forcing Leon to open the Treasure Vault.
It must be mentioned that even while pregnant, Cecilia, as the Prime Minister, continued steadfastly at her post. It's not that Leon is heartless; rather, as a Green Dragon, her ambition for power when dealing with intelligent beings is as strong as other dragons' greed for wealth, and she is unwilling to relinquish her power no matter what.
The people favor the youngest child, the Emperor favors the eldest son.