Sa Ra can tell her change of heart. While her feelings toward Gi Jun are growing stronger, she has to prepare for the death anniversary of her mother with him. Gi Jun finds out that Sa Ra's mother was the informant who had gone missing. Sa Ra finds out that her mother was the Na Yu Mi case's witness and that Na Yu Mi might've not killed herself. She must reveal the truth behind this case, and the keyman is the part-timer Bae So Hee who worked with her mom.