Won Il is a natural in swimming, but a tragic happening in his childhood made him stop. Now he prefers to spend his days eating, sleeping and causing trouble. U Sang on the other hand is a nominee for the next Olympic games. He's also very hardworking and prefers to be left alone. A rash decision on both sides leads to them being roommates in a sports school, where both boys become members of the swimming team. Now it's time to see who is the best!