I'm a Noble in a World Where Bloodline Determines Everything

In this world, bloodlines decide everything. Lu Chen, a fallen noble who died fighting in a rebellion led by lowborn peasants and victims of the blood plague, is reborn ten years in the past. Should he first find a way to prevent the coming war, use his knowledge of the future to benefit himself, or draw on ten years of experience to grow stronger as quickly as possible?

Hearing footsteps outside the door, Lu Chen decides to give his disobedient stepsister a spanking first, then settle old scores and get even with everyone who wronged him!

P.S. Inspired by the all-too-common theory of bloodline superiority. The humans with bloodlines in this book are demi-humans with animal traits.