Would you tell me why my Korean girlfriend is working at a hostess bar.?

Your girlfriend works at a Hostess club because she has financial needs to be met. Her job entails she entertain and converse with both women and men, in a completely nonsexual way and hostess clubs pay well to waitresses with repeat clients. Hostess clubs hire women and men to suit their clientele's aesthetic interests as well as other nonsexual interests, such as sports, food, or general company during an otherwise full and busy schedule.

In hostess clubs One may not pay for sex, but if One spends a lot of money (which generates Her revenue) AND One's hostess finds One attractive she may want to have sex with said person, although it has been noted that some host's/ hostesses have sex away from the work place TO generate finances, but regardless of ethics this is an occurrence of almost any profession given the proper conditions and variables coincide.

If this doesn't help, I suggest you ask her the same question you asked Us.