The snake demon Bai Ruohan, with a thousand year cultivation, could have ascended to the immortal realm, but in order to repay his kindness, he secretly stayed in the mortal world and married his benefactor Su Zihao. Unexpectedly, the second daughter Lin killed Zihao's parents and blamed Bai Ruohan for pushing her into the deep sea. Bai Ruohan was fortunate enough to be saved by her best friend Lu Qing. After waking up, she found out that she was pregnant and decided to give birth to a child and investigate the culprit. However, Su Zihao suddenly suffered from brain cancer. Bai Ruohan risked her life to save Su Zihao, but because Lin You had caused harm, Su Zihao's life was hanging in the balance. Bai Ruohan had no choice but to launch a blood sacrifice to save Su Zihao's life with the child's life. Later, the two investigated Lin You's true face and gradually regained their love for each other. With their concerted efforts, they brought Lin You to justice. However, just as the two of them felt that everything had ended satisfactorily, Bai Ruohan was kidnapped by the ultimate villain Luo Chenfeng to draw spiritual power. Su Zihao came to save him, but he would die. Bai Ruohan had to use his last spiritual power to save Su Zihao, and thus he was destroyed. In the end, when Bai Ruohan dissipated, her thousand year old friend Lu Qing couldn't bear it and used her thousand year cultivation to fulfill their marriage