This book is also known as:
"After I Became Emperor, She Regretted It"
In the struggle for the throne, his elder brother took the crown that should have been his. His childhood sweetheart, a princess of the commandery, looked down on him and left him for his brother. The throne was stolen, and the woman he loved betrayed him.
Heartbroken, Chen Moyuan left the capital in a daze.
But his elder brother even sent assassins to kill him!
Then something unexpected happened.
He was still himself, but now he was utterly cold and brutal. A soul that had survived twenty years in a zombie apocalypse had transmigrated into his body, or perhaps the soul of his next life had returned.
In just three days, he reclaimed the throne.
After he became emperor, his childhood sweetheart regretted what she had done. She wanted to start over, saying there was still a chance for them.