Life of being a secret guardian angel

Something about this life is quite interesting. A girl who wants to be a violinist someday, got in love with the new mysterious boy in her class.But, It will disturb her job as a secret guardian angel.But in fact, she doesn't know who is she supposed to protect.

Will she be able to get his love? will she able to succeed in becoming a pianist?Will she still be continuing her part as a guardian angel?