The Northern Grand Duke’s Mad Son-in-Law

Galahad, an elite mage serving in the Intelligence Bureau, finds himself sold off as the Northern Grand Duke's live-in son-in-law for political reasons. The Grand Duke's daughter, as cold as ice, is actually the key to defeating the Demon King and saving the world. Determined to win her heart, Galahad approaches her in his usual fashion—with madness and a level of initiative that defies common sense. But there's one problem: she's a Swordmaster whose power burns away mana. Even holding her hand forces a mage to endure excruciating pain that pierces through their entire body... “I want to touch her again. This time, for a little longer—”