The Fourth A*N.JELL

Park Nico (Park Shin-hye) stayed at an orphanage with her twin brother Park Nico (Played by Park Shin-hye too) since childhood, when their father passed away.

After her brother has become a music idol, now Park Nica with a name Nicalyn lived in junior nun dorm to reach her dream of nun.

Her idol twin brother Nico, successfully win the "A*N Entertaiment" vocal auditions for musical band "THE FOURTH A*N.JELL", but Nico must leave in order to correct his botched plastic surgery in United States. Kim Bum(Mi Nam's manager, played by Kim In Kwon) approaches Nica's/ Nicalyn's to pose as Nico while he recovers, Nica's/Nicalyn's is against it at first, but agrees in order to fulfill her way of finding their mother, Nica/Nicalyn's posing as Nico join the band(THE FOURTH A*N.JELL) and meets its members, that remembered her(Nica/Nicalyn) the three statue on junior nun dorm: Lee Min Ho (Jang Geun Suk), Kang Jung Shin(Jung Yong-hwa) and Jasper (Lee Hongki).

At first, Min Hodoes not like Nico and makes her life hard,

Kang Jung Shin and Jasper are friendly to her.

Mim Ho discovers that Nico is a girl and threatens to reveal it, Jung Shin discovers it but does not reveal it and develops feelings for her, Jasper has curiosity of Nico's act.

The story follows Nica/Nicalyn to keep her lives away from the cameras and some untrusted people, also THE FOURTH A*N.JELL members and their trusted people efforts to keep the secret of fake Nico's(Posing by Nico's sisters, Nica/Nicalyn) from a publicity.