He's My Real Brother, Duke

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The Novel currently has 79 chapter in status being released.

The story has content about the genres Fantasy, Romance that is extremely attractive and engaging.

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In a fantasy novel, I possessed the hidden younger sister of the Male Lead, “Astel.”
While my brother Cassian is struggling for the revenge of the family, it’s my job to find and deal with the final Villain that has not been revealed even at the end of the original!!
In order to do that, I must first enter the northern Duke Castle, where the family’s traitors are hiding.
Somehow, I became an “imprint of companion” of Duke Anais, a beast of beast and a leading candidate for the final Villain.
Besides……
“Please kiss me now, Astel.”
In order to live, you need to have daily skinship with your ‘imprint partner.’，
There was no such thing in the contents of the original story!
“’Shall we go see your favorite sea today?”
” I …… I don’t think I can. I decided to meet Sir Cassian today .”
The Duke gritted his teeth with a cold face . I was slightly scared as I saw him. Maybe he’s teething. Because it’s a wild beast!
* * *
One day after I received the Duke’s favor and consideration, My older brother Cassian left his nephew for a while.
However, the Duke seems to have made a huge misunderstanding.
“It will become our child.”
“··What is that……?”
“Casian Gray will disappear from this world now, so you will not become his bride.”
Yes……?
When did I become Cassian Gray’s bride, we are relatives?