The Guilty One

Hye-in starts posting more pictures taken with Na-yeon's expensive stuff. She goes overboard and even tries on Cheongdam High's uniform. Na-yeon catches her in the uniform and finds the pictures Hye-in's been uploading. Hye-in begs Na-yeon not to tell her mom about it, and Na-yeon makes Hye-in run errands for her instead.