Chinese secret agent Da-hee receives intel that a large number of illegal firearms are being smuggled into Korea and is sent to investigate the case. She meets Su-han, who is supposed to help her with the case, but due to his lackluster skills they fight over trivial things. But as their witnesses are suddenly murdered, the two of them quickly become the prime suspects.

A golf bag filled with cash sets off a furious chase between an unemployed man, a delivery man, gangsters, a killer, and a cop.

“When I’m sad, I go into the water. Then your tears turn into nothing.” Do-wan is happy when he is in the water. He doesn’t speak much, and has no friends and no mom. But when he is swimming, he feels peaceful. As far as he is in the water, he feels so comfortable as if he were in mom’s arms. Because Do-wan likes water and is talented with swimming, he keeps working hard to become a swimming athlete. His father, who hates water dreadly, objects to his son’s dream to become a swimming athelte. Due to the repeated conflict with his father, Do-wan drifts apart from his father gradually.