Before she became part of the clique, Ji-won was friends with Su-in (Nam Sang-mi), but her ego turned her to regard the introverted Su-in as a laughingstock. Ji-won visits her last remaining clique member, Mi-kyung, who is confined to a mental hospital, but the latter lashes out at her. Ji-won learns from Su-in's mother that the event that led to her amnesia was a trip to a forest with the girls, from which Su-in never came back.