Kang Ho Goo (Choi Woo Sik) has a twin sister, Ho Kyung (Lee Soo Kyung). He has tried to pass the civil service examination, but has failed for 7 years. One day, he meets Do Hee (UEE). She was the most popular girl when they were in the same high school. They spend the night together, but the next morning he finds a baby next to him and Do Hee is gone.
