Two girls go missing in a peaceful village a day after the SAT exam. While the evidence of murder is discovered but not the corpses, Jung-Woo, a model student and the classmate of the two missing girls, is suspected. She confesses but claims the blackout for not remembering anything. 10 years later, she serves out her sentence.

Nakyum feels bad for Jung-Woo's circumstances and urges her to leave for Seoul together. An investigation of the past incident of Jung-Woo begins, and Sang-Cheol casts doubt on the case.

Boyoung's mom's demand provokes Goo-Tak. Also, Ha-Seol notices something strange from the village neighbors when Su-Oh falls into a fit. Meanwhile, Ha-Seol is astonished to see Su-Oh back from the hospital, who seems completely different.