There are a few unusual things about «Cafe Go Yo». Number one, their coffee sucks. Number two, their customers never order off the menu. And number three, Go Yo, the cafe manager, is deaf. So when Soo Hwa joins as a part-timer, though he is not expected to learn how to make good coffee, he is asked to expand his sign language vocabulary beyond the words: «higher», «pay» and «please». But when Go Yo offers to give him private lessons, Soo Hwa is reluctant. Not because he doesn’t want to study, but because he has a «hard» time around Go Yo. Like, literally. He gets hard. Whenever he hears Go Yo’s deep, sexy voice.