Behind Her Highness's Smile

When the king offers Aerik Cladinae his own sister's hand in marriage for his meritorious deeds in battle, he didn't expect to get saddled with a limping, drooling woman like Miesa Esquillre. Driven insane by her brother's physical and psychological torture, Miesa rolls around on the ground, spills food all over herself, and screams unintelligebly as a way of communicating. But sometimes, Aerik catches a flash of shrewd understanding behind those vacant eyes. Is Miesa truly as mad as everyone thinks... or is she hiding something?

(Source: Webtoon Entertainment)