She Became The Devil's Legacy
Once transformed into a demon, Evelyn would have the body of a demon, the soul of a demon, and more importantly Irzey - that is, the Old God, or the will, a part of the personality of the Old God would be lodged inside her body.
The Old God was defeated and banished to the Old Realm by the New God, and then he felt vengeance and hatred, which was retained in another form in Irzey's spirit, which is probably why the Demon King, who had inherited the will of the Old God, plotted to open a passageway to the world of man and take revenge on the New God.
Only later, because of her existence, Irzey had a disagreement with the Demon King. As a result, Irzey simply destroyed the Demon King as a host
ตอนยอดนิยม