Miss A Introduction

Miss A

Miss A made their official debut in early July 2010. 

Originally, Miss A was announced as a trio consisting of Fei, Jia and Suzy in June 2010.

Prior to this, they were widely known to fans unofficially as JYP Sisters.

They were a 5-member group in training in 2009, but had gone through several changes, most notably the exit of Hye Lim who joined the Wonder Girls, while two other girls had left. 

Suzy had then joined after this, and a name change was issued.
On June 22, 2010, Miss A was officially announced as a quartet, with Min joining the group. 

 On June 30, the girls premiered the "Bad Girl Good Girl" music video for their debut single, "Bad But Good" containing 4 songs.

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Source: Crunchyroll