Park Jinyoung .

His name is enough for Yugyeom to see red. The mob boss loathed the black haired agent. Jinyoung was the leader of Police Department , and he had an acrimony for the mob boss. The two had grown up as best friends. However, their friendship soon turned into a rivalry, which only became stronger and more competitive as they aged.

Eventually, Jinyoung was crowned the chief agent. Whereas Yugyeom chose a path of drugs and violence. Both very successful in different ways.

No matter how many times Jinyoung attempted to bust Yugyeom for his unlawful acts, he was always two steps behind the cruel man. The agent would have given up if it wasn't for the death of his close friend DoYoung; the person responsible,Kim Yugyeom.

Jinyoung is out for revenge and will stop at nothing to win. That is hard when the mob boss is ruthless and wouldn't bat an eyelid if three of his employees were killed. However, Yugyeom has one weakness.

His nerdy princess.