Lucifer was once the highest-ranking angel in heaven - Seraph, who served as the archangel before his fall. Because he refused to surrender to Christ, the Son of God, he led one-third of the angels in heaven to raise a rebel flag in the northern border of heaven. After three days of a huge battle in the heavens - the Battle of the Stars, Lucifer's rebels were finally defeated by Christ, and fell in the chaos for nine twilights before falling to hell. After that, God created a new world and mankind. In order to take revenge and seize the new world, Lucifer ordered Azazel to turn into a snake and sneak into the Garden of Eden, seducing Eve to eat the fruit of the forbidden tree of knowledge, and then used her to seduce Adam to commit the crime of disobeying God's order. So Lucifer fulfilled his wish and caused God's new creation to fall together, and opened the door to this new world for the devils. Since then, sin, disease, and death have finally spread all over the earth.