Huo Jinyan's family background was considered good, but there were too many rumors about him. At first, Gu Chen did not like him, but after thinking about it, it was better if Lu Ning experienced the hardships of the world as early as possible; it would also be good if she were to lose interest in men along the way.
He did not know if Huo Jinyan would stay for long, but he had a strange temper. Perhaps one day, if the two of them got together, Lu Ning would not be able to stand his temper anymore and decide to break up with him. She'll become completely disappointed in men and focus on being the boss. That'd surely be wonderful!
Therefore, after thinking about this, Gu Chen decided not to stop Huo Jinyan from appearing beside Lu Ning as Gu Zi did.
Moreover, such things could not be stopped forcefully. Rather, if they interfered too much Lu Ning might actually get together with Huo Jinyan for real.
Hence, Gu Chen let nature take its course.