Apink - South Korea's All-Natural Innocent Girl Group
The Naturals

One of the first huge "innocent groups," APink was launched in 2011 and took the KPop world by storm with a string of saccharine but catchy pop tunes that would help define a sugar sweet but essential KPop sub-genre, perhaps perfected by GFriend in 2015.

Their monster hit Mr. Chu put them in the top five of all KPop girl groups along with SNSD, f(x), Sistar, and Miss A. Here it is:

Girl Group