Lucky Seven (2012)

7 detectives, each with their own unique style in problem solving, work at the same detective agency. Each detective is in charge of their own case file until one day, the cases somehow seem to tangle up together into one big mystery. Inevitably, the detectives are left with no choice but to team up together in tackling the intriguing, but complex mystery. Despite differing opinions and amidst complications, the detectives work together to unravel the truth behind the suspect's agenda.