In the Beginning, I Was Sacrificed to Heaven by the Empress, but I Reversed the Marriage Contract

He became a groom just after time travel, but on his wedding night he learned that he was just a stepping stone on the bride's road to immortality. Faced with the empress' coercion and inducement, he was desperate and successfully entered into a marriage contract with the empress with the help of the system, officially becoming the new uncle of the First Demon Sect. However, dangers came one after another, including the great elder's frame-up, the coveting of hostile forces, and even the famous and decent sects came to him one after another.