Ye Jian didn't know how powerful Hou Zi was but she knew that in her past life, when she was working at a security company, her boss had some relationship with Hou Zi. When her boss knew that Ye Jian was being chased by a powerful person, he wanted to ask Hou Zi to protect her.
However, Hou Zi didn't do it. Not only that, he even gave her boss a piece of advice: Send the person away. He won't interfere.
This was enough to prove that Ye Ying came to look for Hou Zi in the past. She wanted to ask Hou Zi's men to get rid of Ye Jian.
Her boss had no choice but to send her away because of Hou Zi's reply. When he called her to his office, he sighed and said, "What kind of powerful person did you provoke? Even Hou Zi isn't able to deal with the person."