Sun-hui is shocked that her cell phone and workbook are back in her room. Just then, Su-yeon comes over, demanding Sun-hui to turn herself in, and as soon as Sun-hui refuses her offer, she goes missing. Meanwhile, police officers questioned Kyeong-ho's friends from school and found out that stab wounds were the possible cause of Kyeong-ho's death.

Sun-hui grows more suspicious of her family after a van tries to hit her. She is told about the boy in the picture, and the man who introduced himself as her dad's relative turns out to be a police officer. Meanwhile, Su-yeon's belongings are found in the Han River, and Sun-hui begins to look for information on the Gongseo-dong Fire and Kidnapping Case.