The younger brother Jong-hyeon (Won Bin) is a good-looking class-A fighter. The older brother Seong-hyeon (Shin Ha-gyun) is unbelievably tender and pure a class-A student. They've been fighting nearly non-stop for 17 years. Trouble began when their mother (Kim Hae-suk) favored Seong-hyeon over his younger brother. Round 2 began when both brothers fell for the same girl the most beautiful girl in the neighborhood Mi-ryeong (Lee Bo-yeong). When the long-simmering emotions finally explode and a huge fight breaks out Seong-hyeon tells his younger brother something he had never been able to say before: "Jong-hyeon would you call me hyeong just once? I've never heard it before from you..." "Hyeong" - the word that younger Korea brothers call their older brothers. And yet Jong-hyeon has never said it to his brother.