Jae-kyung puts the puzzle pieces together of the day Jun-seo died, and a rift between Jong-soo, Tae-jin, and Ji-yeon pushes them apart. Meanwhile, Jae-kyung, Yun-jin, and Joo-song visit Hyun-woo, discover the whole story between Jun-seo and the medication incident, and then find a clue to the murder at the mill.
