Hindsight( Hangul :푸른소금; RR :Pureun Sogeum, literallyBlue Salt) is 2011 South Korean film by Lee Hyun-Seung who finally break after ten year hituas. the film is about a hitwoman who who stuggled feelings for underworld boss whom she tagerted it. the film has issue of age diffence and Korean underworld it stars Song Kang-ho and Shin Se-kyung .the film premined is 16th Busan International Film Festival .

Doo-heon (Song Kang-ho), once a legendary figure in Busan’s organized crime scene, now wants to live a quiet life, hoping to run his own restaurant. One day, he meets Sebin (Shin Se-kyung), a daring and spunky young girl in his cooking class who is actually a gangster and former shooting champion hired to kill Doo-heon. As she gets to know Doo-heon, who turns out to be surprisingly warm-hearted and considerate, Sebin finds herself not wanting to complete her mission.