Kim Hye-in has to transfer to Cheongdam International High School after witnessing a murder. She crosses paths with Baek Je-na, a bully who happens to be connected to the case.
So-mang catches Si-eun and Hye-in in the secluded restroom. After hearing how Si-eun blackmailed Hye-in, he promises to help her. On the day of Yul-hee and Woo-jin's anniversary, the ugly truth gets revealed. Hye-in witnesses something she shouldn't have again.
