Myeong-jun and Hye-eun's complicated past unravels, and Sang-yun remains resolute in his suspicions about Hye-eun. However, Sang-yun gets suspended for failing to apprehend Myeong-jun and can no longer investigate the murder and kidnapping cases. Meanwhile, Myeong-jun hides himself in Hye-eun's house and discovers a mysterious object. Myeong-jun's suspicions about Hye-eun begin to grow.