Why Are You Doing This, Duke? Manhwa

Erin Samed, the neglected illegitimate daughter of the Samed family, is offered as a sacrifice after the notorious Duke Rowan Peruka captures her republic. As she faces execution, something strange happens: the cold, feared duke becomes her husband—and she is his first wife, not his third or second. Rowan calls Erin his beloved songbird and treats her with startling affection, giving her hope that their marriage might be true love. But his devotion appears to come from a mysterious magical spell, and its effects are fading by the second. Erin’s life may depend on the unpredictable love of the duke known as the Grim Reaper.