A twenty-year-old lady named Sangeun Cha is pretty, sweet, and very good at origami. She also has a loving family and friends. But she had a secret that she has a seven-year-old intelligence with 'mental retardation' level 3. There are still a number of things that she needs to learn...! The innocent and pure lady fell in love with a young guy named Jongbeom. Then one day, after her mother dropped by a hospital, Sangeun saw her mom crying. Why is she crying?