Aunor made her debut in February 2013 with an original song called "If You Ever Change Your Mind", which was also written by her. Her song was one of the twelve finalists selected from the 2,500 songs from the auditions. The song won as the third place in the 2013
Himig Handog P-Pop Love Songs. On 7 March 2013, Aunor signed a contract with
Star Music as its recording artist. Vehnee Saturno became her manager. Aunor was part of the Middle East Leg of the World Tour of the Philippine daytime television series
Be Careful with My Heart. However she later decided to withdraw from the competition due to her talent management's decision. Her self-titled album was eventually released on 4 July. In 2014, Aunor became one of the finalists in the
Myx VJ Search. Aunor was chosen to interpret one of the finalist song at the 2014
Himig Handog. The song was entitled 'Pumapag-ibig' and was written by Jungee Marcelo. She performed the song with Rizza Cabrera and Seed Bunye at the finals night of the Himig Handog on 28 September 2014. On 3 September 2015, it was announced that she would be performing under the stage name of Marion, dropping her surname. She then released her second studio album,
MARION, on 31 August. The album tracks "Wanna Be Bad" and the cover song "
I Love You Always Forever" were featured on the movie
Ex with Benefits. She also wrote the carrier-single "You Don't Know Me" for the
debut album of actress
Kathryn Bernardo. On 13 February 2018, she signed a new management under Viva Artists Agency for Viva Records and began releasing music under her full name. On February 7, 2020, she released the single "Mahal Kita Ngayon", under the name Marione. In 2022, Aunor alongside her sister Ashley provided the music for the controversial Darryl Yap films
Maid in Malacañang and its sequel
Martyr or Murderer which depicted the legacy of Philippine dictator
Ferdinand Marcos as a hero. ==Movie actress==