Drama also known as Masked Legends: Secrets Between Us | The Poisonous Enigma; An immortal was tricked before his death into marrying a foolish granddaughter of a powerful family. Initially, he planned to ignore her, but he soon discovered that her unique bloodline was essential to his cultivation. Reluctantly, he decided to secretly protect her. The female lead was once infamous as the "madwoman" of her family, known for her violent and unpredictable personality, as well as her unfathomable skills in poison. However, when faced with her savior, she chose to hide her true self, pretending to be an obedient and gentle girl by his side. Yet, her younger sister, driven by greed for the family fortune, relentlessly bullied and oppressed her. Forced into a corner, the female lead had no choice but to transform into a ruthless figure in the shadows, hiding her true nature from her savior as she navigated the challenges and dangers that surrounded them.