How did we meet?

1. Date of birth

August 31, 2004. A child was born who was beautiful, cute, had great proportions, was good at singing, dancing, and had the best facial expressions... Her name was Jang Won-young.

And the twins born that year, Kwon Eun-bi, Lee Chae-yeon, and Kim Min-ju, who have the same abilities...

And Sakura..

And first is Jo Yuri, second is Choi Yena, third is Kim Chaewon..

And An Yu-jin...

And Kang Hye-won...

And Nako..

Lastly, Hitomi..

And these 12 people will meet later, but how will they meet?