Why is Kaiyuan called grandpa of inner entertainment cp?

Because of Karry and Roy, their CP fans. He was also the first fan to open cp in the entertainment circle, so all the fans were Karry and Roy, the grandfathers of cp in the entertainment circle. At that time, before TFBOYS debuted, Roy and Karry were trainees of a company, and the video of their cooperation was put online by the company, which gradually opened up their popularity. So after TFBOYS debuted, fans began to beat their cp.