Based on

Movies like Puzzle (2006)

Five strangers, each with his own special talents, are recruited by the mysterious 'X'. They do not know why they are brought together, but nonetheless agree to a series of potentially lucrative schemes. A planned bank robbery goes awry when a minor mistake leads to a hostage situation. The robbery is orchestrated by Hwan. When Hwan turns up dead at the designated meeting spot, the remaining men realize something is seriously wrong, and suspicion flares.