Superintendent Kim Seokjin - one of the members of CIDG who handles his brother's case after the failed operation.
Kim Namjoon - Leader of the group know as Bangtan, a huge drug group in Asia. He has many stage name like Runch Randa, RM, and God of Destruction.
Kim Taehyung also was known as V- Namjoon left hand, he's the one handling shipment and the works in the group.
Chief Inspector Jeon Jungkook - One of the members of CIDG and also one of the group whole handle Bangtan Case. He has a huge crush on Seokjin because he always takes care of him like a brother.
Chief Inspector Park Jimin - Seokjung partner. He's has a great mind as he easily memorizes anything. He also has a crush on Jeon Jungkook.
Deputy Director General Min Yoongi - The head of CIDG who handle many cases especially the Bangtan. He has much mystery inside his pocket.
Other Characters :
Senior Superintendent Kim Seokjung - Seokjin older brother who got accident while he's in operation.
Zico - Namjoon Arc Enemy.