Gu Zheng is not from T City, but his maternal grandparents live there, so he spent quite a bit of his childhood in T City.
Moreover, his grandfather and Song Yansheng's grandfather were old acquaintances, so the two of them have known each other since they were very young.
Gu Zheng's grandfather was a soldier, but he retired by then, with three daughters and no sons.
One of these daughters is Gu Zheng's mother, and Gu Zheng was close to his maternal grandparents since childhood, which gave him the desire to join the army.
As for his family's business over in S City, Gu Zheng wasn't worried about it since he had a younger brother who was very business-savvy.
Nowadays, Gu Family's father has mostly retired, and the family business is mostly managed by the second son.
Currently, in S City, the Gu Family is considered one of the leading families and major corporations.