Yu Mo, a 32-year-old single mother, while busy with her studies, also has to take care of her daughter Mu Dong, who is in school.
However, what she doesn't know is that student Yi, who is 7 years younger than her, has been secretly in love with her for three years.
The innocent little puppy in his junior year doesn't know how to win the heart of his elder sister Yu Mo, but unexpectedly forms an alliance with Mu Dong. With the assistance of the quirky Mu Dong, an alternative campus romance begins!
