Finding her

Song Zhilan looked at the giant mansion located on the outskirts of the city. It looked as if someone had made the mansion between the gigantic mountains. The view was as beautiful as it was terrific. As his car entered the gate of the mansion, he saw guards in the same black uniform that he saw in the party venue, which meant the guards belonged to the Long family. 

It strengthened his assumption that Zuni was somehow related to the Long family. If she was related to this Long family, how come Song Jingren had no idea about it?