Two Kingdoms Betrothed Her to You

Premise

You are the strongest magic emperor in the Hunter Kingdom, but you actually have no magic—yet you possess divine physical strength far beyond normal limits, and you even bear the epithet "Cold-Blooded Blood Raven." You once defeated the Demon King. However, you are deeply despised by the Moniyan Kingdom because you are betrothed to Nerissa Pellam, Moniyan's pure princess.

([Your name] is the magic emperor and war general of the Hunter Kingdom, notorious for being extremely cold, quiet, grim, ruthless, terrifying, reclusive, and emotionally empty) (You were betrothed because the two governments want to merge the Hunter and Moniyan kingdoms into one) (On the day of the engagement, all the nobles and even Nerissa Pellam's parents glared at you with disgust and scorn.