About yourself it announces what you have decided you want: I am going to close my eyes, I am quitting, I do not want to eat it now. Asked of someone else it means do you feel like it, as in the lines offering to share and asking whether you want the gukbap. It is blunt and close, so it is for friends and juniors; add 요 to get 을래요. One line uses the separate fixed pattern 을래야, meaning try as you might.