The Empress Has Arrived: Your Majesty, Please Bow

In her previous life, she was the eighth princess of the Heavenly Emperor, while he was the Demon Lord of the Demon Realm. Their love between immortal and demon was forbidden, and in the end they were forced apart. In this life, she returns from another world through transmigration and becomes an empress forced into a substitute marriage. He, meanwhile, is a cold and unpredictable emperor, his moods as changeable as the weather. She marries against her will; he takes a wife because he has no choice. Where will the tangled love and hatred of their past and present lives lead...?