That young man is an introvert.

那个年轻人是一个性格内向人。

And extroverts also tend to be more personable, faster to charm, soakers of attention. while introverts often are alone in a corner.

外向人给人感觉更英俊，更快让人着迷，更引人注意。同时内向人经常自呆在角落里。