I have bound the world-destroying witch

After Xia Feng's time travel, his heart was inexplicably pulled out. Instead, there was a defective Demon heart whose activity was only sufficient to last for eighteen years. This was a magical heart that could synchronize the power of the target. To survive, he bound himself to the future villain who was destined to destroy the world, the witch who would destroy the world. The stronger the world-destroying witch is, the stronger he will be! So Xia Feng realized that it wasn't my fault for stirring up trouble: "Miss Witch, I admit you're strong, but not strong enough!"