After domestic violence caused death, the little fairy bound system exploded

Su Muyan, a great demon in the demon world, was designed by the emperor to erase her memory and forcibly enter the body of a woman who already had a husband and son in another world just because she had a love affair with the son of the emperor of the god world. Afraid that her son would find out, she deliberately designed a plan for a man to beat her to death. But in the end, someone found out. Seeing the woman he had secretly loved for tens of thousands of years just die like this, he was unwilling to accept it. So a love-minded man spent all his cultivation to fight for her chance to be reborn, and also turned his magic weapon into a system and gave it to someone, and voluntarily entered the three thousand worlds to accompany her. (Mine: The male protagonist is not actually the son of the emperor, but was designed by the emperor with secret techniques. The male and female protagonists will return later...