Lee Yoona is known for being a goody-two-shoes. She's a teacher's pet with a perfect record and natural leadership qualities. Her future looks as bright as the sun, until illegal items are discovered in her locker. Yoona did not put those items in her locker, but they have no evidence of who did. She is to be expelled from high school. Yoona knows this will ruin her future, so she begs for a solution. Thanks to her previously perfect record, she is allowed to stay. But on one condition: she is to be the manager for the boy's varsity dance squad. Yoona takes the job immediately, expecting it to be easy. She was so wrong. This varsity dance squad is unlike any other. It's made up of the 7 most reckless boys she's ever met. In fact, their group is so dysfunctional, they can barely get anything done. Yoona decides to change that. She picks the group up off their feet and sends them to competitions all over Korea. The Bulletproof Boys may dance like nobody's watching, but the truth is, everybody's watching.