Depicts the struggle surrounding the 10 billion won underground economy.  A successful fund manager, Jang Tae-ho, whose seemingly fool-proof financial deal goes horribly awry, leading to a loss of 350 million and his business partner;;;;;;s death. In desperate straits, Tae-ho goes on the run from loan shark gangsters and descends into the underbelly of Seoul. He discovers a secret society of homeless people living inside Seoul Station, one that has its own strict hierarchy and rules. Tae-ho vows to find out what went wrong with his deal, claw himself up from rock bottom, and get his life back.