The summary of this drama is pretty accurate. Its a time traveling drama about a daughter going back 20 years to meet her mom. The current relationship between the daughter and mom is not very good. The daughter blames the mom and ask what happen to her dad. Some how the daughter ends up time travels back to when her mom was in high school. There she meet the male lead. He goes to school with the mom and is in the same class. The daughter goes back in time to find out who her father is. As she gets to know her mom she understands her mom. They are best friends through the story.

Daughter aka female lead is a sunshine girl, real , cares about her friends
Mom aka second. female lead is a little hot head, loud, but also really nice, not too smart in school
Male lead aka daughters love interest is smart, caring and a gentlemen ,always caring for the female lead

The story focuses on friendship between the high school students/ encounters like college entrance exam, graduations etc. There is also love story that blossoms between the male and female lead. Even the second male and female character. Some heart-wrenching moments too, where i feel for the third male character

It's a good amount of romance, school and family.

The story line is nicely developed and rounds back at the end where she goes back to the current times. Its a good story of appreciating the single mom.