1第 1 集
The top student in Class S of Jeonghan High School mysteriously dies. Knowing the real cause of death, Min-young struggles to cover up the incident.
2第 2 集
Soo-young happens to give the mysterious cookie to someone at work. But this one cookie becomes a threat to the sisters' lives.
3第 3 集
While investigating Yoo-jung's death, a detective notices that the cookie is at the center of the case. Min-young attempts to derail the investigation.
4第 4 集
A detective visits Soo-young after discovering the cookie's connection to Min-young. Infuriated by the accusation, Soo-young looks for the truth.
5第 5 集
Seong-pil, a consultant at the school, calls Min-young privately and offers to help her. Meanwhile, Soo-young's investigation of the cookie leads her to the school.
6第 6 集
With Seong-pil's help, Min-young tries to get out of the cookie business and turn herself in. However, her plans go awry when she encounters an unexpected person.
7第 7 集
Soo-young heads to the school to avenge Min-young and takes Won-ju, a cookie distributor, hostage. The chef doesn't budge, and Ho-soo gets caught up in the fight.
8第 8 集
To save Min-young, Soo-young decides to become an employee of High Cookie. She disguises herself as a transfer student and sells the cookies at Jeonghan High School.
9第 9 集
Soo-young's seemingly smooth business faces a crisis as she gets involved with Jin-woo, the chairman's grandson. Is it all a part of Soo-young's operation?
10第 10 集
Through a sweet school life with the cookies, Soo-young often forgets about Min-young. Meanwhile, Seong-pil tries to use Soo-young to find Chef.