"Five years ago, on a blood moon night, Ruth, a hotel maid, stumbled into the room of Arthur, the Vampire King. Bound by the pull of soulmates, they shared one night, and Ruth fled the next morning. Now, Ruth is a desperate single mother whose half-vampire son, Leo, suffers from a rare ""photophobia"" illness that requires a fortune to treat. When a chance encounter brings her to Arthur's castle for a high-paying job, he instantly recognizes his mate. Furious at her disappearance, he coldly torments her, but she endures it all for her son's life. When Ruth's greedy aunt sells Leo to the extreme ""Exorcism Courtyard,"" Arthur, sensing his bloodline in danger, arrives just in time to witness Ruth shielding their son with her own body. He shatters their defenses with a roar: ""Who dares touch my son!"" The family is united. From protecting his wife and child from a jealous noblewoman to showering them with absolute devotion, Arthur proves that for the ones he loves, he will destroy anyone who stands in their way. Their story ends in a grand wedding and a long-awaited happily ever after."