one of the reasons the Chester was able to kill Yulia's brother and father was because the royal family lost a war and that weakened their power. she believed that it was inevitable for her country to lose the war because that was how the original story went, so she made a deal with the Chester that if he won the war, she'll marry him.
He comes back victorious after 6 months and confesses to her that during the time they were apart, he realized that he really does love her spiritually. Yulia becomes moved and for a moment she really felt that someone truly loves her unlike her brother and father who could only see her dead mother in her...
After two chapters she started douting again.
