a)this is a person's name lives in US
everyone lives in korea hates him terribly
b)this is used in terrible case such as the word''fuck''
c)a word to trick or cheat someone
man:you stole my documents which is my company's core!
man:and, you took my pulse and all my money when i was not in my place!
woman:yeah! i hate you very much, and i will kill all of your familly and you!
man:Fuck you!,you are ohno!