Chu Muzhi, who lives in a village in the city, originally wanted to live a stable life, but was involved in a turmoil because of the secret left behind by his grandfather. From documents in the cellar to smuggling of cultural relics, he guards the public welfare classroom, protects the people around him, and fights against the darkness in the smoke. Memories will fade and grievances will be settled. Only the sunflowers in the alley and the light in the heart will always face the sun.