When did Cao Zhihong and Song get together?

Episode 7. In the seventh episode of TV series Fengyun Tiandi, Song helped Cao Zhihong sign a big contract, and Cao Zhihong took Song to see his mother and got together. Fengyun Tiandi is a joint venture between Shanghai Emerald Oriental Communication Co., Ltd. and Beijing Energy Film and Television Communication Co., Ltd., with director Jing Wong as producer and screenwriter, Chen Yiming as producer, and Wang Mingquan and Hawick Lau as stars.