About a group of survivors who have to fight for their lives against mutants that are created when humans breathe mysterious dark smoke from a sinkhole. [About] Dark Hole is an upcoming South Korean television series starring Kim Ok-vin and Lee Joon-hyuk. The fifth series of OCN's Dramatic Cinema project which combines film and drama formats, is scheduled to premiere on OCN TV on April 30, 2021. The series premiere was the #1 episode in its time slots across all Korean cable channels in the 20-49 age demographic. [Source: Wikipedia]