Gwang-Sik and Gwang-Tae are brothers who share opposite views on women. Gwang-Sik is shy around women and finds it difficult to even speak around women, Gwang-Tae is a playboy who enjoys sleeping around with women. One day, Gwang-Sik sees Yoon-Kyung for the first time in seven years. Around the same time, Gwang-Tae meets Kyung-Jae at a marathon. Something changes for the brothers.