1x4 - Black Dog

For a permanent teacher who’s coming back to the school from her vacation, one short-term teacher must leave the school. Everyone believes that it should be Ha Neul. Because of Song Young Tae, short-term teachers are in a tight spot in front of the students. Meanwhile, Soo Ho decides to track down teachers’ IP addresses to find out who posted about the corruption at Daechi High on the website.