This drama is about the story that surrounding the idol stars.Kang Woo Hyun (Park Yoo Hwan) is a leader of the group M2 captivates fans with his killing smile. Ji Seung Yeon (Go Eun Ah) dreams of turning into a legend of the hip-hop. she has to dress up like a man to join a men’s idol group. Kang Chang Min (Kevin) thinks that the world turns around it, and dreams of being a soloist of ballads. Ri Ah (Kim Eun Jung) is a great celebrity that represents the whole nation.
Cha Yeon Jin is a high school girl whose outwardly normal existence and reticent character masks her true identity: she is a professional assassin who is seeking vengeance for her mother after watching her killed in front of her eyes. She infiltrates SS1, the secret organization that her mother was connected to, by becoming one of their killers, all the while trying to track down her mother's murderer.
A love story about Princess Nak-rang who fell in love with a spy from Goguryeo. She tore the drums of her country so that Goguryeo could attack her country, Nangnang-guk, without warning. However, Nak-rang's love story with Hodong is further complicated due to the fact that Nak-rang's older sister Ja Myung is in love with Hodong as well.