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It's All Over When You Get Tangled Up In a Case (1x9)

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Jae-kyung knocks on Yun-ho's door to arrest him for the murder of the mill owner. Meanwhile, Jae-kyung, Yun-jin, and Joo-song gather at Jae-kyung's house to look over Lee Myung-guk's work log. Joo-song prepares a surprise birthday cake for Yun-jin, but an unexpected guest comes.