I Refused My Sister’s Bone from the Start and Bound a Cashback System

Hu Xia awakens the memories of his past life. In this life, he has no intention of gouging out his biological younger sister's Supreme Bone to reach the pinnacle as his predecessor did. A double pupil is already a path to invincibility; why borrow someone else's bone, especially his own sister's? So he binds himself to a return System and starts treating his sister as well as he possibly can, without holding back. After breaking through to become a Great Emperor, Hu Shenyuan is shocked to discover that she has lived another life. But she is even more astonished to find that her older brother not only left her bone untouched, but treats her with boundless kindness, making her question everything she knows.