The two people were talking happily, saying good things about each other. However, as they left the Underground Heaven, Mao Shan specifically warned Song Yun that although Lei Chenyu seemed easygoing, he was actually a real opportunist. In other words, he would only be agreeable if he could gain something he desired from you. If you had nothing to offer, Lei Chenyu would basically ignore you.
Song Yun was naturally aware that people like Lei Chenyu were common in society, a type often referred to as "won't release the eagle until they see the rabbit." They would never engage in anything without benefit. This type of person is difficult because of their stark realism, but the advantage is that business dealings with them are very straightforward. Once a deal is made, unless greater benefits arise, they generally won't stab you in the back.
