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Dong-chan gets jealous of Woo-jin, who worries for Soo-hyun. Meanwhile, Ji-hoon thinks Soo-hyun, who keeps claiming Saet-byul is going to die and searches CCTV in the house, is out of her mind and doesn't understand her.
Soo-hyun comes back to 2 weeks before Saet-byul's death. She asks Woo-jin for help, but Woo-jin, who meets Soo-hyun after 10 years, find Soo-hyun's behavior strange. Eventually, Soo-hyun decides to catch the murderer herself and looks for Dong-chan.
Soo-hyun promises Saet-byul to go to Snake's concert to spend some quality time. She also invites Young gyu. Meanwhile, Dong-chan finds a photo of Young-gyu and his mom at Bong-seop's place and wonders why Bong-seop has the photo.