The friends you make when you are poor and in a low position are called "poor friends";

Friends who are friendly and close as brothers are called "the turn of Jin Lan";

Friends who share weal and woe are called "embarrassed friends";

Friends formed when encountering hardships are called "friends in need";

Friends with similar interests and deep friendship are called "friends who don't look back";

A good friend of the opposite sex who grew up together is called "friendship of bamboo and horses";

Friends who associate as civilians are called "friends of cloth";

Friends of different generations and ages are called "forgetting to make friends";

Friends who don't care about their identity or appearance are called "forgetful friends";

Friends who don't change their deep friendship because of the change of nobility and inferiority are called "car hats";

Friends who support each other morally are called "friends of gentlemen";

Friends who are like-minded and know each other well are called "friends who have never met before" ("friends who have never met before").

The etiquette for two disciples who have been friends for generations to meet their elders was also called sworn brothers with different surnames in the old days. It's called "Eight Friends Worship"