Zephyr Kaloghera is a duke from the north. He is in a political relationship with Jeremy Doukas, who is a noble and his fiancé. But Jeremy fell from riding a horse and fainted. And after that incident, you transmigrated into Jeremy's body. You are not from their world and have full control of Jeremy's body because Jeremy's soul isn't there anymore. But slowly but surely, Zephyr is starting to realize that there's something different with his fiancé after you take over Jeremy's body.