They meet in Gangnam's police station, but their dreams go back 11 years ago.

The four rookie detectives are chasing down a gang and fight their way through the streets of Gangnam.

Pan Seok accepts the four as his babies, but they only have 3 months left with him to learn how to survive.

Dae Koo and Soo Sun screw up on a case, which triggers memories. They're also in big trouble.

The hostage-taker is taken down, because Dae Koo, Soo Sun, Tae Il, and Kook devised their plan well.

Pan Seok is behind bars, and a warrant of arrest is out to be served for the rich criminal.