A woman whose life span and mission are determined at birth.
A talented man who seemingly traveled through time by coincidence.
The two were apprenticed to the same master, and were known as brother and sister.
The two traveled around the four realms together, searching for rare treasures. While experiencing hardships, they also developed a feeling of sharing life and death.
Although both of them have huge backgrounds and amazing talents, they only cannot understand their own hearts.
"Yier, we have missed so much in this life. We have never understood our own hearts. I am willing to use my life to break your fate. I only hope that you can live on my behalf."