My favorite manga/Blmanga/manhwa recommendations

The Precious Sister of The Villainous Grand Duke

She was reborn in the war novel as the sister of the villain who had never shed blood nor tears.
The person acting as my 'brother' was a villain who, after losing the war, would be sealed away by the male lead.
So all I have to do now is pretend to be his sister until he later disappears.
Or so I thought...