Hindsight (Korean: 푸른소금; RR: Pureun Sogeum, lit. Blue Salt) is a 2011 South Korean action drama film by Lee Hyun-seung, his first after a ten-year hiatus. The film is about a hitwoman who struggles with her feelings for the underworld boss who is her target. The film deals with issues of age difference, and the Korean underworld. It stars Song Kang-ho and Shin Se-kyung, and premiered at the 16th Busan International Film Festival. The film received a total of 763,776 admissions nationwide.