The birth of the illegitimate Prince Sirius Hyperion proves a centuries-old legend: the royal family carries wolf blood. Tortured by envy yet unwilling to kill Sirius outright, the emperor sends the 10-year-old boy to the notorious Duke Rhodes' brutal estate—where even the duke's children have not survived his infamously harsh education. Years of abuse drive Sirius mad, and he eventually sets out on a lonely path of revenge.

Among the duke's three surviving children, the youngest Elena was never meant to exist. She is a reincarnated woman with knowledge of Sirius' fate who also possesses a special power but remains helpless under the gaze of her cruel family members. However, Sirius' arrival changes everything. Stuck together in a cycle of suffering, Sirius and Elena forge a bond that may alter Sirius' fate, define Elena's existence, and even turn vengeance into an unexpected romance.