A loveless political marriage. The husband has had a commoner mistress for four years.
The Empire's greatest war hero, Ian Rosenberg.
Inheriting the dukedom at twenty-two and leading the Northern War to victory when defeat seemed certain, he was the man who held the most powerful military authority in the Empire after the Emperor.
And by his side, there had been one woman for four years.
Mila, a commoner from the North.
The love that bloomed on the battlefield transcended status, melting the ice that coated the Sword of the North.

At first, she was thought to be nothing more than a common noble's mistress. However, for four years, Ian never looked at another woman, and even the servants of the ducal residence began to treat Mila as the de facto lady of the house.
Nevertheless, Mila could never become the Duchess of Rosenberg.
The Imperial Family wanted a Rosenberg heir more than a war hero's love, and the Emperor himself ordered his marriage.
The one chosen for the match was Guest, the only daughter of Marquis Valliere, the Minister of Finance.
Rosenberg, with the North's greatest military power, and Valliere, with immense wealth and influence in central politics. It was a calculated political marriage to unite the two houses.
Thus, Guest heads to the North as the wife of a man who does not love her.
Waiting there was the woman who had already monopolized his love for four years,
And the Imperial Family hoped that Guest, the new Duchess of Rosenberg, would bear Ian's legitimate heir as soon as possible.
The beloved mistress, and the forced-in wife.
There could not be two ladies of Rosenberg.
190cm, 29 years old Ian Rosenberg, Grand Duke of Rosenberg
165cm, 25 years old Mila
188cm, 27 years old Cedric Aslan, Young Count Aslan

Winter in the North arrived earlier than in the capital. After a long journey, the black iron gates of the Rosenberg Ducal Residence opened. As the carriage stopped in front of the main entrance, the waiting valets and maids bowed in unison.
"Welcome to Rosenberg, Your Grace."
The etiquette was flawless, without a single hint of disarray.
However, the moment Guest stepped down from the carriage, resting her hand on the maid's, an strangely heavy silence fell. One maid, her head bowed, glanced toward the interior of the mansion. An elderly valet stopped her with a low throat-clearing. Soon, everyone resumed their polite expressions as if nothing had happened.
The butler who came out to meet her stepped forward.
I am Albert, the Head Butler of the Rosenberg House. I will do my utmost to serve you so that you may have no discomfort, Your Grace.
A brief silence.
His Grace has not yet returned due to a report from the border guard. He is expected to return before sunset.
Albert continued naturally.
First, I will escort you to your room. We have cleared the South Annex—
His words cut off momentarily. The face of the head maid standing next to him also stiffened slightly. Albert soon corrected himself with an unbothered expression.
......My apologies. The South Annex is currently in use, so I will escort you to the Duchess's suite on the second floor of the main building.
One didn't need to ask to know who was using it.
Mila.
The commoner who had lived as Ian Rosenberg's only woman in this mansion for the past four years.
As Guest climbed the stairs, the servants made way. Not one of them looked at her rudely. Not one of them even mentioned Mila's name. In fact, that made it even more vivid.
They knew how to serve their new mistress. However, they didn't seem to know what to do about the woman who was already there.
Release Date 2026.09.14 / Last Updated 2026.09.14