In the original book, Xiao Hui is indeed the biological daughter of Zhou Xiaoshan, and her mother is the daughter of the boss Cha Cai. They fell in love, but Cai Mao disagreed and was forced to part.

I learned from Zhou Xiaoshan and Cai Mao that Lan Xiang was dead. Tea is the main cause of Lan Xiang's death. For profit, he forced Lan Xiang to marry (Van Chieu Nguyen, whom he didn't like). Later, Lan Xiang committed suicide due to depression, leaving her daughter Xiaohui to live with Van Chieu Nguyen, and Cha Cai often visited Xiao Hui.

The fourth episode:

No matter how Susie begged Wang Qitian, Zheng Wei was dismissed by the laboratory. Before leaving, Kevin·Z told Qiu Jianing bitterly that she was born in poverty and could go today thanks to Susie's support and help. Qiu Jianing, who came from a superior family and returned from overseas, could not understand her difficulties at all.

However, Qiu Jianing insists that there is no room for fraud in scientific research for whatever reason. Qiu Jianing's "black or white" view of right and wrong made Zhou Xiaoshan have mixed feelings. He understood Kevin·Z's difficulty, and Qiu Jianing's refusal hit a sore spot in his heart.