As One (Korean: 에즈 원, stylized as AS ONE), also known as AS1 in South Korea (to avoid confusion with Korean musical duo As One), was a Hong Kong Cantopop girl group formed by Sun Entertainment Culture and choreographer Sunny Wong.

[1][2] The group promoted as a quartet for two years until Oli's departure in August 2014 to pursue her studies.

Subsequently, two new members (Chloe and Kayan) joined the group in March 2015 after emerging as champions of a scouting audition.

Elfa announced her temporary hiatus from the group in May 2015 due to sustained injuries.

Shin participated in South Korea Mnet's survival show Produce 101 in 2016; during this time, the group continued with three members.