Woo Sung is confused after seeing Yeo Joo lie about not knowing Baek Soo Jung’s perfume. He tells Jin Ho his suspicions about his wife. However, his speculations about her escalate as Jin Ho reveals what he knows. Meanwhile, the detectives think they can gain a crucial clue in the case and reluctantly head to Yeo Joo’s house. Later, Yeo Joo explains her deductions regarding the murder and shocks the detectives.