Marine Boy (2009)

"Marine Boy" tells the story of a former swimming athlete (played by Kim Kang-woo) desperately in debt and because of this, becomes employed as a "body packing" drug mule by a heartless drug lord (played by Jae-hyeon Jo). After swallowing a 10-meter-long drug package, "marine boy" must swim across waters between Korea and Japan. Among the many things that beckon death, an alluring beauty (played by Si-yeon Park) tries to seduce him.

Trailer :