New BADKIZ member Hayoung introduced herself to fans in a handwritten letter.

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On September 20, Zoo Entertainment posted Hayoung's letter below, which says:

"Hi, GOODKIDZ! This is Hayoung, and I'm a new member of BADKIZ. I made my first performance on September 16, but I was nervous and made a few mistakes. It is a little embarrassing when I think about that time. But I think I did a better performance yesterday than my first, and I am glad that I'm getting better. I've been showing shy attitude to you guys for a couple of days, but actually I'm a person who can show you powerful dance & rap. So it's going to be fun to know about me. There are plenty of time, so I think we can get to know about each other little by little. NO RUSH! XD Back on my first day, I was able to relax because of some fans who told me nice words like 'Cheer up' and 'You did a good job'. I will be doing my best efforts to catch up other members and to give strength to our team. Thank you for reading this and hope you guys have a wonderful day. XOXO Hayoung."