For how she eats ramen. Jesus Christ. It's not like the director and the rest of the staff bukkake'd on the pot lid before she put the ramen noodles on it.
As I see it, it's just something really fucking stupid that got blown out of proportion, but that always happens between Japan and Korea. Next Japan will hate on IU for only receiving a bukkake from nine Japanese men when normal Japanese girls receive a bukkake from ten Japanese men. They fight over little shit and it's old.