Kim Mi Kyung was revealed to be the true killer.

On the Thursday episode of MBC drama "I Miss You" the Gangnam Police Station janitor Song Mi Kyung (Kim Mi Kyung) turned out to be the real criminal behind the murder.

Zoe/Soo Yeon (Yoon Eun Hye) had been named the prime suspect in the murder of Kang Sang Deuk and with the help of Harry/Hyung Joon (Yoo Seung Ho) and Jung Woo (Park Yoochun), she was released. Zoe says that she saw the back of the criminal and said it seemed like an older woman.

This narrowed down the suspects and they find out that the criminal ordered dry ice using Jung Woo's computer. However, while she was using the computer, the surveillance camera was off, which meant that it was probably an inside job.

Jung Woo remembers that the suspect was wearing a white band around her wrist and remembers the janitor did so as well.

Jung Woo goes to find the janitor who tells Jung Woo to come into her house and shows him her daughter's uniform and her things. Jung Woo finds the noose and the tape that was used in the killing and he is soon tased by her.