Mido is kidnapped to serve as a living blood source for a young master with a rare constitution. Expecting abuse and death, she instead encounters Baek-gyeong—a man who appears gentle, beautiful, and harmless. He claims she is his only hope and persuades her to stay by his side.

While Mido searches for a chance to escape, Baek-gyeong gradually breaks down her defenses with his kindness. Their relationship becomes a tense battle between one trying to escape and the other trying to possess. After accidentally tasting her blood, Baek-gyeong’s suppressed madness erupts, deepening his obsession with her.

As their connection takes an unexpected and dangerous turn, Mido struggles between fear, confusion, and the need to return to her own life—leaving her to question whether she can ever escape the beautiful madman who refuses to let her go.