Strangers from Hell - Season 1 Episode 2 -

On the first day at work, Jong Woo meets with his colleagues and starts to work at Jae Ho’s company. Meanwhile, Hee Joong in Unit 310 decides to go to the 4th floor to find out what makes the pounding sound. As soon as he sets his foot in the dark and creepy place, he realizes that he’s in big trouble.