A Si 阿肆 formerly known as arrogant Si, is a female singer from Mainland China. In 2010, A Si registered as a musician under the name of "Presumptuous Four" and released a number of songs. In 2011, she released her solo single "I Eating Fried Chicken in People's Square" and it began to make a name for herself. In 2012, A Si signed a contract with Modern Sky. In 2013, she released her first solo music album "Premeditated Encounter"; in the same year, she won the best folk singer of the "Sixth Music Awards Newcomer Festival". In 2014, with "I Eating Fried Chicken in People's Square", she won the Top Ten Golden Melody Awards in the "21st Eastern Billboard Awards Ceremony".
- Name: A Si 阿肆
- Birthday: July 4, 1989
- Birthplace: Shanghai, China
- Occupation: singer
- Masterpieces: 《我在人民广场吃炸鸡》、《有女朋友别忘了请我吃饭》 "I Eat Fried Chicken in People's Square", "If you have a girlfriend, don't forget to invite me to dinner"
- Main Achievements: The Best Folk Musician of the "Abey Deer Music Awards" in 2011 The Best Folk Musician of the "Sixth Music Awards Newcomer Ceremony" in 2013
- Agency: Modern Sky
- Active Years: 2011 - present