It's not easy being Ho Goo, a low-key guy who can neither score a date nor score high enough on his civil service exams, which he's failed 7 years running. But when he has a chance reunion with national swimming champion Do Hee, the most popular girl of his high school, his luck begins to change — perhaps for the worse. After staying out all night with Do Hee, Ho Goo experiences a rude awakening when he realizes that not only has Do Hee left him, she's also pregnant!
Ho Goo has never dated in his life. He runs into his first love Do Hee. She is a member of the national swimming team and has a burning desire to win. She also talks like one of the guys. After Ho Goo meets Do Hee again, he becomes involved in a complicated romantic relationship and a dangerous friendship.