Please help me explain "Qingke" and their lives.

Distinguished guests: assistants and guests.

It first appeared in the Spring and Autumn Period and the Warring States Period. In order to strengthen the national strength and gain the right to exist in hegemony, the vassal States compete to recruit talents and make suggestions for them. Later, it refers to those who are supported by powerful families to help or do things. They mainly depend on the powerful, do things for their sons, and sometimes don't do practical things, because most of the distinguished guests are literati, so those rich children rely on them to decorate their faces, that is to say, spend money to buy face and be arty.