Leaving Chongqing may have been the best choice for Zheng Zexin in his 18 years of life, but 10 years later
It seemed that he had another reason to go back... "Zheng Zexin, is the fog in Chongqing really heavy?"
"Hmm" was so big that it took me 10 years to see clearly what was hidden behind the fog in Chongqing?
Purpose: Character growth