In the previous life, the younger sister, Chancy Lin, was chosen to marry Lord Serpent. Terrified, she begged her older sister, Yara Lin, to go with her. Yara had a soft heart and agreed—but Chancy betrayed her, pushing her onto the serpent's bed instead. By some miracle, Yara survived and became the new Lady Serpent. Chancy, on the other hand, panicked and ran into the serpent lair, and both sisters ended up dying in the end. After their deaths, Yara was reborn—only to realize that Chancy had also come back. Jealous of Yara's glory from the last life, Chancy swore to use her memories to seize the title of Lady Serpent for herself this time. Even with their parents trying to advise and persuade her, Chancy refused to listen. Meanwhile, Yara decided that in this life, she would protect what was hers—her place beside her Lord Serpent. Chancy copied everything Yara had done before and went to marry Lord Serpent, not knowing that the reason Yara survived last time was not luck.
