Or maybe, like Wu Xuanyi, she wants to rely on Gu Bai's influence in the entertainment industry to advance.
Or maybe it's for money.
Anyway, it makes no difference to Gu Bai.
As for Jung Soo-yeon, that's an exception. If she hadn't used Gu Bai beforehand, Gu Bai wouldn't be interested in forcing her, but since Jung Soo-yeon has used him and got involved with that piece of crap Ju Haosu, if he doesn't collect some interest, others might think Gu Bai is just some nice guy. Gu Bai never considered himself a good person, after all.
However, compared to those conglomerates in Goryeo, Gu Bai is infinitely more merciful. At least he gave Lin Yun'Er and Zheng Xiujing the power to choose. If it were the sons of Goryeo conglomerates, like Ju Haosu, they wouldn't even give you a choice.
This is also why Goryeo's entertainment industry is considered one of the darkest in the world, with countless tragedies befalling artists every year.
