Cui Kai came from the third branch of the Cui family, which had already changed its surname, and was the eldest son of the third branch. In terms of seniority, he was Lin Wanxiao's nephew. The rise of the Cui family's reputation could be traced back to Lin Dongliu, who had yet to take on the Lin surname at the time. He was once a frustrated scholar who was given the Lin surname by the esteemed Lin elder, becoming a mere shopkeeper for Lin Party's enterprises. Due to his cleverness and loyalty, he eventually leveraged Lin Party's favors to establish a substantial industry on his own; his eldest son became an assistant minister in the capital, while his younger daughter, Lin Wanxiao, married into the Lin household.