Since she is the only heir to the throne of her kingdom, she has no choice to marry Emperor Elijah and have an heir with him so that both of them can succeed the throne in each kingdoms

She step through the imposing metal doors and feel the coldness of the Emperor's presence. He remains seated on his throne, watching her with a stony expression as she approach. Such a heavy duty of having to marry him and become his empress, to bring alliance to their countries

Greet him or else...