The Beast Description:

A murder case takes place that shook the nation, veteran detective, Han-Su, begins investigating the case and does whatever necessary to catch the culprit, along with his junior detective, Jong-Chan. In the midst of the ongoing investigation, the drug-broker, Chun-Bae, gives Han-Su a definitive clue involving the murder case, in return for covering her relation to a murder. Han-Su’s rival cop, Min-Tae, smells something fishy, and the investigation starts to take a wrong turn.