Former national swimmer Cheon Soo dreams of traveling to Palau, and to fund his trip he works as a swimming instructor by day while gambling at night. However, after losing a game of poker he finds himself heavily in debt and in trouble with the loan sharks. Kang, the head of a local drug syndicate, offers to pay off Cheon Soo's debts; in return, Cheon Soo must work as a "marine boy",
