Lie For You, Die For You Episode 13

Mage-queen Clare is forced by her dying king's pact to marry Orlando—a humble, magicless commoner. For three years she mocks him as a freeloader, never knowing he is Lucifer, Lord of Hell in disguise, crushing trolls, sea-monsters and invaders to protect her realm. When the pact ends and Orlando vanishes, Clare crumbles. She only learns the truth when trolls breach her capital. Humbled, she begs him to return—and this time proposes, with a king's heart, not a contract.