Kang Tae-Joon (Minho) is a gold medalist in the high jump, but he has been stuck in a slump due to an injury. In order to assist her idol, a lady named Koo Jae-Hee (Sulli) disguises herself as a boy and enlists at the very same all male high school.
When Tae-Joon (Minho) is competiting at the World Junior Competitors, Jae-Hee (Sulli) sees him on TELEVISION in America and becomes really touched.
Despite her good friends telling her otherwise, Jae-Hee cuts her long hair by herself. She then flies to South Korea, with a plan to stay with Tae-Joon who is now hurt. Jae-Hee disguises herself as a kid and enlists at the all kids Genie Athletics High School. On her very first day at school, Jae-Hee goes up the stairs with her suitcase, but her luggage bursts open and all her clothes fall out. A young boy comes by and assists her choice up her things. Jae-Hee recognizes that the kid assisting her is none besides her idol Tae-Joon. In her enjoyment, Jae-Hee rests on her luggage, which continues to slide down the stairs.
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Jae-Hee gets to her first class and presents herself. Among her classmaste, Jong-Min (Hwang Kwang-Hee), informs her that if she wishes to become their schoolmate she will need to go pickup a ball that sits inside a dog house located on campus. Jae-Hee goes to the dog house and sees a caution indication about the dog. However, the pet dog seems friendly to Jae-Hee and she goes inside to get the ball. At that moment, Jae-Hee hears Tae-Joon voices and she hides in the dog house. Tae-Joon begins to talk with the dog and informs the canine that he does not wish to carry out the high dive at tomorrow’s commercial shooting. Tomorrow will be the first time Tae-Joon does the high dive after experiencing his injury. If he is ok after his injury, jae-hee comes out of the doghouse and asks Tae-Joon. Tae-Joon becomes mad and leaves.
She goes back to the classroom and provides the ball to Jong-Min, who is extremely shocked. The canine is normally hostile to people that come by. Eun-Gyeol (Lee Hyun-Woo), who is a soccer gamer, takes a look at her with a smile.
Later on, Jae-Hee goes to her dorm space and finds out that she is sharing her room with one other student. When she leaves the shower, Jae-Hee sees her new roommate, who is Tae-Joon! Tae-Joon instantly kicks her from the space, however with the help of Seung-Ri (Seo Jun-Young), the student dormitory display, she has the ability to get back into the room.
The next day, trainees at Genie High School collect to play soccer. If she makes an objective he will let her remain in his room, Tae-Joon informs Jae-Hee that. Jae-Hee strives to score an objective, but clashes with Jong-Min and gets knocked out. Tae-Joon carries her to the school infirmary. Before she wakes up, Tae-Joon goes to the school fitness center where the high jump commercial will be shot. Meanwhile, Tae-Hee wakes up and she understands that the school doctor knows that she is a lady.
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