In a wasteland world where humanity has collapsed, medical student Lu Chen picked up a mysterious man who had lost his memory from the rubble, named him "Zero", and taught him how to read, eat, and control his strength. Zero relies on him and protects him like a loyal dog, becoming his only comfort in the last days. Until someone from the shelter told Lu Chen: This "big man" with pure eyes was the monster leader who massacred thousands of people three years ago.
