The Wicked (2014)

Se Yeong is the new employee at an office. She's a bit awkward and introverted. Her stubborn team leader is Lee Seon who takes a quick dislike to Se Yeong's weird personality. Lee Seon picks on Se Yeong in her backhanded ways. Eventually Se Yeong stands against Lee Seon. Lee Seon is upset by Se Yeong’s behavior, but she soon learns about ominous stories about Se Yeong. As the stories about Se Yeong are revealed one after another, she becomes a source of fear to Lee Seon. But soon Lee Seon finds herself the target of Se Yeong's wicked ways. Se Yeong’s stalking-like bullying continues, and Lee Seon tries to run away from her.