C574 A Promise from Ten Years ago

Originally, he was going to call Gu Chengxuan by his full name out of habit, but after Si Ying's previous lesson, William obviously took it. He pursed his lips and smiled, changing his words quite quickly.

Hearing William call him father, Gu Chengxuan was a little happy in his heart. He did not stop. He turned around and went to the back door of the car