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After School's Lizzy, who transformed into a trot singer, made an appearance on 'Weekly Idol'.
 
On the January 28th episode of MBC Every1's 'Weekly Idol', Lizzy appeared as a guest after making her comeback with trot song "Not an Easy Girl".
 
Lizzy's "Not an Easy Girl" gained attention as the song features a short rap by MC Jung Hyung-don. On the show, Jung Hyung-don revealed the story behind his featuring on Lizzy's solo song "Not an Easy Girl". It happened to be Lizzy's mother who actually cast Jung Hyung-don for the featuring, not Lizzy.   

From the beginning, Lizzy asked Jung Hyung-don for the featuring. However, Jung Hyung-don didn't accept her request easily. So Lizzy asked her mother to record a voice message for Jung Hyung-don.

Upon hearing Lizzy's mother's voice message with full of aegyo, Jung Hyung-don couldn't refuse her request anymore. Since Lizzy is close to Jung Hyung-don, he happily decided to feature on Lizzy's solo song.