+Tuan Natasha Woolim said that Kei is the face at first, during their debut days. Actually during their Pre-debut days Sujeung is the most popular based on her SNS acc. and etc. Many people dont know about Lovelyz yet. But when many people know them and recognized them, it was actually Yein and Miju who got praised a lot because of their visuals esp on 'Hi`' era. Miju & Yein are the most popular members. Actually their popularity is kinda the same but when you look at polls/ surveys its Yein who got the most votes. So Woolim is utilizing Yein's visual and as you can see, in 'Ah-Choo', she got so many screen time and she is the center at the chorus. In 'For you' as well, she got the most screen time on the MV. Basically she is the face now. But everybody is beautiful and great so don't worry.