It Was Supposed to Be Just a Contract Marriage, but the Cold-Hearted Duke with Only One Year to Live Dotes on Me

Rachel, the daughter of a marquis, lost both of her parents several years ago. Since then, she has devoted her life to one thing above all else: saving her younger brother, who suffers from a debilitating illness. But one day, she discovers that her fiancé, Alois, is plotting to kill her brother in order to inherit the family title and estate. Worse still, Rachel herself is murdered to keep the scheme secret. When she finds herself sent back to the past, Rachel vows that this time she will protect both her family and her brother. To do so, she seeks out Duke Gislan Hubert, a man feared throughout the kingdom for his cold-hearted and ruthless nature. "Please marry me." What was meant to be nothing more than a marriage of convenience based on mutual interests begins to change. Though Gislan is initially distant and icy toward her, his attitude gradually starts to soften...?