A creature action thriller series about the desperate survival of the survivors among the mutant humans who drank a mysterious black smoke from the sinkhole and soon turned into monsters and quickly became a pandemonium.

Hwang Shi-Mok had brain surgery when he was a child, which caused him to lack emotion. Now, Hwang Shi-Mok works as a prosecutor. He is rational, but cold and lonely. He is also one of the only prosecutors not involved in corruption. One day, a dead body is thrown in front of him. He meets Police Lieutenant Han Yeo-Jin at a murder crime scene. They work together to eradicate corruption at the prosecutor’s office and solve a serial murder case.

Kang Chul Soo (Lee Joon Hyuk) is an enthusiastic fireman. He poses as a nude model to make money for his sick friend. He is then targeted as the criminal of an arson-murder case that took place 10 years. Kang Chul Soo and mysterious heiress Han Jin Ah (Jung In Sun) try to find the real culprit.