OCN's "Black Hole" is directed by Kim Bong-joo of "Cell Phone" and written by Jung Yi-do of "Hell Is Other People" and "Save Me". It is a bio-action suspense story about the miserable survival of people who survived among the mutant humans who inhaled suspicious black smoke from a sinkhole. Kim Ok-bin plays Lee Hwa-sun, a detective of the Seoul Metropolitan Police Agency's wide-area search team. After receiving a call from the murderer who killed her husband, she came to "Muji City" and ushered in a turning point in her life. Lee Joon-hyuk plays Yoo Tae-han, a rescue vehicle driver born and raised in Muji City. He usually looks peaceful and jokes, but in fact he has a stronger sense of justice than anyone else.