Who is the best princess in the world? (Sera!) Pink Leader Sera Sera (세라) is a South Korean singer. She was a member of the girl group Perfume de Ange. She has graduated from Perfume de Ange in the end of October, 2020. On December 2, 2020 she has suddenly declared about her graduation from the live idol world on December 10, 2020 because of mental instability and being unable to do idol activities. Her last idol activities will be on December 26, 2020.