You Know What? It's a Secret 2(있잖아요 비밀이에요 2)

Three highschool girls try to get money from their parents to help pay the hospital bills for a friend. They come up with a scheme where one of them pretends to be kidnapped in order to receive the ransom money. However, the plan is revealed and two of the girls are taken into police custody. When released, one of the girls jumps from the roof of the school out of shame and to call attention to the plight of their friend.