Huo Antong and Liu Jun had seen each other before, so they could be counted as acquaintances. They didn't know each other well, though. At the very most, they greeted when they saw each other.
Now, for a level-five zombie nucleus, Huo Antong was trying very hard to get close to Liu Jun. He didn't want Liu Jun to feel strange about it, so he mentioned some moves that Zuo Chen and his people were making. He knew that even if he didn't mention it, the base would soon find out about those people. He was purely using that as an excuse to talk to Liu Jun.
He had done some background search. Liu Jun had a son, and was once hurt by an awful man. She was probably traumatized, so her son might be the only chance to win her heart.
However, her son stayed with Lin Xiaolu, the little princess of the base, all day long. Those two kids were always surrounded by a group of bodyguards. It was very difficult for anyone to get close to them without permission.
