After School's Lizzy said "in order to be sexy, Uee told me to keep thinking naughty things" and it has attracted people's attention.

Lizzy attended 107.7Mhz SBS Power FM 'Boom's Young Street' on July 13^th, and Boom asked her "this title song 'Flash Back' has sexy concept, and wasn't it particularly hard for you since you used to appeal cute concepts?" and Lizzy answered as "I know I'm not sexy and it was stressful to pretend something that I'm not."

And Lizzy added "so I asked Uee 'how can I be sexy' and she said 'always think about naughty stuff.' So I tried to watch many naughty moviews." Boom asked if that helped and Lizzy said "but I never could show such expressions from movies on the stage. So I practiced alone in the dark room, watching Jooyoun's expression."

Internet users wrote "Lizzy is so cute" and "Lizzy was deceived by YUI."