The president of Cube Entertainment, Hong Seung Sung, is in a coma for about a week because of a major head injury from a vehicle collision (car accident). Now, the company needs a temporary president and that's his only daughter, Hong Seung Ha. Seung Ha is the oldest of the 3 siblings that Seung Sung have. She is a smart person and can manage the company at the young age; at first, she can't believe what the sister company or A Cube president said to her from the phone then she accepted the fact that her father is in a coma for a week without knowing. As she is the temporary president of the company, she is introduced to the members of 4minute, B2ST, A Pink and solo artists like G.Na Choi, Eddie, Mario, Young Ji, specially the sister company's only group and artist, A Pink and Huh Gak. 

As her relationship got closer with the boy group, B2ST, she too falls in love with the Joker and the Yoon Leader. Will she choose being the temporary president or the girlfriend of one of the two lucky guys?