He Tian Shui (played by Kim Kang-woo), once a representative swimmer of the national team, had his beautiful dream of life shattered due to owing a huge gambling debt. With no way out, he scrambles for money everywhere. The president of an international drug trafficking group (played by Cho Jae-hyun) is secretly carrying out a new plan for drug cultivation, followed by the "Sailor Boy" training with zero survival rate -- smuggling drugs across the sea by concealing them inside human bodies. Tian Shui joins this training. Even more thrilling is the dangerous game of competing for the affection of the charming woman Yu Li (played by Park Shi Yeon). Both men are simultaneously smitten with her and are willing to embark on this one-way road for her.