This story is about Seulgi who made a promise to her childhood friend(Irene)before she left her. They attended different schools, Irene is a normal student of Daegu University and she is famous there because of her look. On the other hand, Seulgi is the exact opposite of Irene though they were both beautiful and talented. Seulgi in the other way is very famous and known as a "Girl Crush" of Seoul Of Performing Arts she is also a very responsible student there. As the time goes by Irene felt distant to her childhood friend. She usually receive a message from Seulgi but many weeks had past yet she doesn't received even one. Until one day an invitation letter was received by Irene, her lips curve into smile after reading the last sentence ".... from SOPA (Seoul Of Performing Arts)"... And with that the story begins.