Swimming instructor, Young-eun is a single mom raising her 7-year-old daughter, So-hyun. However, a series of tragic events happens as So-hyun’s puppy falls from the apartment and dies, and So-hyun…

In 1999, a dance duo teams up with a cheerleader to create a cheerleading club. Together with seven other members, they form the ‘Millennium Girls.’ Their mission: to lead the…