A frightening, yet not unanticipated twist is finally delivered in episode nine of "Tunnel - Drama" and it is about to cause many new concerns for our leads and new questions for us. The time has also come to learn more about Jeong Ho-yeong's past and the focus starts to shift toward finding out what drives him and what has caused the particular preferences that seem to govern his M.O.
In the most unsurprising twist ever, coroner Mok Jin-woo (Kim Min-sang-I) is our original killer, giving us a lot of new things to consider. It has been clear that he is hiding things and although this is the most obvious twist, it is not a disappointing one, since the mystery is not the drama's sole appeal. I am curious to see his own story and even more so how he managed to hide his identity and still be hired by the police for his job.