Reborn to Marry a Vampire: My Sister and Werewolf Ex Go Mad with Regret

1.

After the thousand-year war between werewolves and vampires ended, both sides signed the Supernatural Peace Accord, agreeing to rule the world together.

The accord stipulated that every hundred years, an interspecies marriage would take place. Human women would be wed to the leading families of the werewolves and vampires. Whichever family produced the first mixed-blood heir would become the rulers of the Supernatural Alliance for the next century.

In my past life, I chose to marry Marcus