http://www.asianfanfics.com/story/view/25813/hallelujah-action-gdragon-key-minho-shinee-taemin-top

Trailer:

Summary: Lee Taemin is an under appreciated assistant at the SM Security and Intelligence Agency. He's all but ignored by his fellow agents and does nothing more than deliver coffee all day, but with the arrival of Special Security Agent Choi Minho, Taemin's life is about to get a lot more dangerous. The YG organization has launched their T.O.P assassins in a conspiracy against the government and it's up to SM's intelligence team to stop them at all costs.

Characters:
Secretary and agent in training- Lee Taemin
Special Security Agent- Choi MInho
Intelligence Agent and computer hacker- Kim (THE KEY) Kibum
Intelligence Agent- Kim Jonghyun
Team Leader Special Agent- Lee (Onew) Jinki
YG Assassion known only as THE DRAGON - Kwon Ji-Young (G-Dragon)
YG T.O.P Assassin- Choi Seung-Hyun (TOP)