Siheyuan: Head of the Public Security Squad from the Start

A minor cop from the future transmigrates into Zhong Jianren, who was discharged from the army after being wounded on the Korean front. When he discovers that he works as the captain of the Public Order Section at the steel mill's security office and lives in the eastern wing of the courtyard at Number 95 Nanluoguxiang, he finds himself surrounded by residents like Deaf Granny, Yi Zhonghai, Liu Haizhong, Yan Bugui, He Yuzhu, Xu Damao, and many others. Aren't these characters from a TV series he watched?