Marine Boy Hangul RRMarin Boi is a 2009 South Korean film. The feature film debut of writer and director Yoon Jongseok, it stars Kim Kangwoo, Cho Jaehyun and Park Siyeon in the lead roles. Marine Boy is the story of a former national swimmer who finds himself in debt, and out of desperation is employed as a mule by a gangster boss, smuggling drugs by sea. Yoon regarded the films title as a unique point, saying, There is something beguiling about its duality, how these criminals are called something that romantically calls to mind the popular cartoon Marine Boy or the star swimmer Park TaeHwan.
Knowing the danger he faces, Cheonsoo tries to make a run for it, but he is arrested at the airport by police detective Kim Gaeko. Kim is intent on capturing Kang, and faced with no other choice, Cheonsoo agrees to work as a spy on his behalf. His situation becomes further complicated when he falls for Yuri, a jazz singer under Kangs charge and the daughter of Kangs best friend. But Yuri suspects Kang of killing her father, and she and Cheonsoo plot to take the drug money for themselves.Marine Boy was the debut feature film by writer and director Yoon Jongseok. Yoon said that he first began thinking about the story after watching a very moving film noir, which inspired the type of characters he would later write into his script. During casting he was keen to avoid stereotypes, and for the role of Kang wanted someone who looked more like a businessman than a typical gangster boss, choosing Cho Jaehyun for that reason. Lead actor Kim Kangwoo had to overcome his fear of water, and prepared for his role by undergoing three months of intensive training, which began with learning basic swimming strokes in a pool and progressed to more advanced skills such as scuba diving. Kim went on to film dangerous water sequences without using a stunt double, earning praise from his fellow cast members and the production crew. For her role as a jazz singer, Park Siyeon received vocal training to improve her performance. ........
Source: Wikipedia