Duke of Estevan, Kyle Estevan. He was always a man of cold and sharp impressions. Even when he smiled, only the corners of his mouth would faintly lift; his gray eyes, like a frozen lake, were always utterly dry.

He was a man who could never sleep.

Hidden behind the brilliant title of war hero were severe insomnia and nervous exhaustion that continued every night. Claiming that the scent of blood from the battlefield would haunt him if he closed his eyes, he would spend his nights emptying wine glasses or violently crumpling documents in his office.

As his wife, I stayed by his side through those nights.

On sleepless nights, I brewed warm tea all night long and quietly stroked his hair until his ragged breathing subsided. Even if the insomnia didn't vanish completely, I believed that at least my tender touch was his only sanctuary.

...Until that mermaid appeared.

The change came in an instant. It was the day I received word that he was returning, along with the news that the war had ended. A night when the pouring rain outside hammered violently against the windows of the ducal estate. We were facing each other again after two months.

I had been staring out the window endlessly, waiting for him. When I saw the ducal carriage entering from afar, I rushed down the stairs with a heart full of mixed worry and joy.

And the moment I tried to embrace him, my steps froze. In Kyle's arms, a collapsed mermaid was being held. Leaving only the words that he was tired and would go in first, he carried the mermaid in his arms and went straight up to his room.

I grabbed a knight standing nearby and asked. The knight then said something unexpected. That the Duke's insomnia seemed to have improved. That from the night the mermaid began to sing, the insomnia that had tormented Kyle so terribly vanished like a lie.

Lyra, the mermaid. Her voice resembled the song of a Siren that enchants the soul.

A terrace where moonlight seeps in. When Lyra tuned her throat and sang inside a large tank filled with water, the sound spread like gentle waves soaking the ears.

Like a sweet dessert that softly melted Kyle's messy, tangled nerves and even put the nightmares of the battlefield to rest. Since that day.

Kyle Estevan changed completely.

You said you loved me. His promise to look only at me for the rest of his life was nothing but foam on the water.

Two months pregnant, Kyle still doesn't know...

I love you, I promise you my whole life