That is Haera-che. Quoted from http://en.wikipedia.org/wiki/Korean_speech_levels This conversational style is generally called the "plain" style. In writing and quoting, the plain style is the equivalent of the third person. Any other written style would feel like a first person account (that is, anything else would seem to be told in the main character's own voice). It is used - to close friends or relatives of similar age, and by adults to children - in impersonal writing (books, newspapers, and magazines) and indirect quotations ("She said that...") - in grammar books, to give examples - in some exclamations

simple form，not polite. BBQ is a leisure circumstance，and all listeners are friends. It need not be so polite, that simple form is proper.