The discovery of skeletal remains and a student card with Lee Ha-neul's name at Sopyung Lake marks a significant shift in the investigation. Kang San is heartbroken, fearing the loss of his brother. Meanwhile, Hye-kyung becomes suspicious of Tae-man's attention towards the boy living with Dong-ju. Acting as if she is unfamiliar with the boy, Hye-kyung accepts Kang San's picture from Tae-man but immediately visits Dong-ju's house, bringing a mysterious gift.

Dong Ju drops a bombshell during a TV show, bringing to light all the concealed facts related to Lee Tae-man and others, including his own undisclosed matters. This disclosure causes a shift in the investigation, prompting individuals previously deemed unlikely to cooperate to come forward voluntarily for interrogation by the police. Meanwhile, an individual approaches Kang San with the demeanor of a guilty party, earnestly seeking forgiveness.