Zuo Hang, Tong Yukun, Yu, Mu Zhicheng are all from Chongqing. Su Xinhao is from Henan, but grew up in Chongqing. Zhang Ji is from Jiangsu. Zhang Zeyu is from Harbin, and Chen Tian Runhe Yao is from Shandong. So the three northerners in the three generations of tf family are Chen Tianrun and Yao.