When Jo Gang-Ja attended high school, she was notorious for fighting. She gave birth to her daughter A-Ran in her late teens and became more responsible. Her daughter A-Ran is now a high school student, but A-Ran is bullied at school. Jo Gang-Ja decides to go back to high school to protect her daughter. Jo Gang-Ja becomes a high school student again.
Cheng Shaoshang, left behind by her parents who went off to war, faces challenges from a scheming aunt and struggles with estrangement from her family. Lacking love and security, she is cautious in choosing a marriage partner and meets three suitors: Ling Buyi, the emperor's adopted son; Yuan Shen, a talented figure from Bailu Mountain; and Lou Yao, an aristocrat. Despite a rocky path to love, Shaoshang remains steadfast. Her involvement with Ling Buyi leads them into a mystery surrounding his family and identity and together they confront a national crisis, growing through their experiences and upholding their ideals.
Hae-na who is bound to inherit her family curse which is turning into a dog after getting her first kiss. The only way to break the curse is to get a second kiss. The problem is the guy who gave Hae-na her first kiss is afraid of dogs.
The ups and downs of school, family and growing up test the affection between a budding artist and her handsome but indifferent classmate and neighbor.