The Thorn and the Rose Episode 10

To save her mother, Vivian takes her sister's place and marries Alex, the heir rumored to be bloodthirsty. She alone can soothe his wild madness, and her brilliant mind makes her his indispensable weapon. Together they unite against a common enemy and uncover a century-old bloodline curse. Awakening as a Guardian, Vivian rises from antidote to Queen, ruling a vast empire beside the tyrant.