A Substitute for the Emperor

I hate you to death, but I still can't let go of you.
Even if I send you to fight to your death, you always manage to come back.
You are my salvation, and I am your breath, I love you, my one and only fantasy.
Recan Tenecvan is the leader of an up-and-coming noble faction, who is considered a rebel due to his overwhelming charisma.
Recan, who eventually becomes the country’s first emperor, is an unparalleled genius on the continent.
Winter Rotea is betrothed to Recan from a young age, but hides her identity under the alias Leysha, after her household is unjustly accused of rebellion.
A genius in magical theory, she must kill the stoic Recan to prove her loyalty.