[Immortality + No Romance + System + Time Travel + Not a wish-fulfillment story + Slow-paced + No main characters or antagonists]

Enter at your own risk if you dislike this.

If you travel back to ancient times, the system will give you a daily subsidy of ten yuan. Once you accumulate enough experience points, you can increase the subsidy amount, extend your lifespan, and so on.

Note: This book was inspired by the I Ching and Yin Yang.