Ghost Episode 13

Kim Woo Hyun is the only son of a high-ranking police officer. He breezes through the police academy and graduates from it with honors. After being assigned to the cyber investigation department, Detective Kim finds himself entrenched in a cat and mouse game with a faceless enemy in the cyber world. Tirelessly hunting down the hacker, alias of Hades, he finds out that Hades is his past roommate in the police…