First, Yu Hong is irritable and easy to take the bait.
In the play, after Li Xiaonan was threatened by Julie's family, Julie decided to send Li Xiaonan to work every day in order to control Li Xiaonan. Su rui has no job, so he can only contact his colleagues in Li Xiaonan. At work, Yu Hong often embarrassed Li Xiaonan, while others were gentle with Li Xiaonan. In addition, Yu Hong is short-tempered and careless, and it is not easy to perceive Li Xiaonan's purpose.
Therefore, bringing Su Rui to the office and letting them have sex is also a means for Li Xiaonan to retaliate against Yu Hong.
Second, Yuhong has a strong economic strength.
Although Yu Hong works in a real estate company, her daily dress is fashionable and her maintenance is young, which shows that her own economic strength is still very strong. Moreover, Yu Hong often reveals the information that her family is going to be demolished. She is an out-and-out rich second generation, and also the person with the strongest economic strength that Li Xiaonan and Su Rui can come into contact with, and the one who is most likely to attract Su Rui. Others are ordinary people struggling to make a living, and Li Xiaonan doesn't want others to be involved in this storm.
Su Rui's most urgent goal at that time was to pay off debts, so finding the second generation was the best and fastest way to pay off debts.
Third, Yu Hong is persistent in her feelings.
Yu Hong was born in a patriarchal family, and her parents didn't care much about Hong. So Yu Hong, who lacked love since childhood, is eager to find someone who likes her. In the face of parents urging marriage, Yu Hong wants to find a suitable partner, even if this person is very old or has a family, as long as they like each other, Yu Hong can ignore anyone's eyes.
Julie's gentle and hypocritical appearance just meets all Yu Hong's fantasies and demands, so Li Xiaonan will meet Julie in the office and take the opportunity to leave, creating contact opportunities for Yu Hong and Julie.