Princess of the Demon King

Story:

Read manhwa Princess of the Demon King / 마왕 왕녀님 Princess Seraphina becomes the Demon Lord fated to destroy the world—until she’s killed by Cassiel, heir to the Holy Kingdom. But when she wakes up as a 10-year-old before everything fell apart, she vows to change her fate. While searching for a way to remove the Demon Lord’s seed, Cassiel reappears… as her suitor?!