Driven by intense hatred for the vile man (played by Park Byung-taek) who attacked his wife (played by Lee Mi-ra), the couple (husband: Jo Deok-hyun) decides to take bloody revenge and seeks out a hitman's office. The only hope left for this couple is a hitman (played by Kim Dae-ryung) with near-miraculous skills, diligence, and a reputation for finishing the job cleanly. After verifying rumors through their manager, the couple pours out their tearful story. Today, the vile man will die, no matter what. By heart attack. Meanwhile, at that very moment, the hitman is driving the vile man to the brink of a heart attack. However, not only the vile man, but the hitman himself is in mortal danger. Amidst the tense standoff, a fly that flies in leisurely drives him mad. What's important to him now is catching the fly rather than fulfilling his duty as a hitman. The hitman's hand slices through the empty air. Situation terminated. Seeing the corpse of the fly on his palm, he cannot hide his shock. Mr. Park, a popular public official and former Marine, died of a heart attack. Inside the house where the body was found, no other traces were discovered except for the corpse of a fly stuck to the door. With a statement from his personal physician that he had suffered from heart disease, the cause of death by sudden heart attack is confirmed. The hitman is depressed. An extremely coincidental day, where he fell backward and broke his nose...