A truly mature person will not simply choose a social circle, but can mix well in any circle; People who are really sensible will not lose face, and people who have no conflict of interest with you should be friends. Like-minded, best friends, immature and irrational choice of friends.
I really didn't expect that anyone without conflict of interest can be friends. Whether the road is inconsistent or the personality is suitable. It seems that everything when I grow up is for profit.