Why should they change an important part of their language because some random person who has no idea about korean culture said so. Koreans never tried to change black people’s culture so why do you think that they have a right to other people’s culture. Also, how does any of this affect you in any way? Its their culture and at the end of the day you need to respect it. The word was never intended to disrespect black people so why in the world do you care?