Phantom (Korean: 유령; RR: Yuryeong) is a 2012 South Korean television series, starring So Ji-sub, Lee Yeon-hee, Um Ki-joon, Kwak Do-won, and Song Ha-yoon.^[2][3][4] The police procedural tackles crimes and clues in the cyber world, weaving a massive, twist-filled mystery of murders, identity switches, corruption and conspiracy.^[5]

It aired on SBS TV from May 30 to August 9, 2012 on Wednesdays and Thursdays at 21:55 for 20 episodes.^[6]

Kim Woo-hyun is the only son of a prominent police officer. Determined to make his own mark, he breezes through the police academy,^[7] and along the way racks up accolades, top of the class honors, a lot of praise and perhaps envy from his colleagues.^[8] Assigned to the cyber investigations unit,^[9] Detective Kim finds himself entrenched in an intense cat and mouse game with faceless enemies in the cyber world. Tirelessly hunting a hacker named Hades, he traces the hacker's location to an apartment building and arrives just in time to witness an actress fall to her death from the high-rise.

What appears initially to be a suicide case reveals a trail of crime and conspiracy as Hades broadcasts a video clip showing a perpetrator pushing the actress to her death. Suspected to be the perpetrator, Hades is hunted down by Woo-hyun, who finds out that Hades is in fact his past roommate in the police academy, Park Ki-young. Ki-young escapes, and later infiltrates the police headquarters in search of an important evidence proving his innocence. He is caught by Yoo Kang-mi, with whom he watches a video titled 'Phantom' that reveals a murder linking right back to Woo-hyun. Ki-young once again escapes, but calls Woo-hyun to meet up with him in an abandoned factory. The factory explodes, and one died while the other suffered severe burns.^[5] In a mistaken identity, Ki-young is sent to the hospital for treatment. Ki-young recovers and assumes Woo-hyun's identity, working together with Kang-mi to defeat the enigmatic nemesis and do justice for his friend's sacrifice.