In the novel Human Nature, Lao Yang is the leader of an investment pyramid scheme, and his behavior is illegal and immoral. It is immoral to look at people from the perspective of human nature and understand the value of the industry. It is irresponsible for Lao Yang to treat investment money as a joke. Investment should be a rational behavior, considering risks and benefits, rather than blindly pursuing interests. Lao Yang's behavior has caused losses to others, which is immoral.