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Once Upon a Time is a 2008 South Korean film, directed by Jeong Yong-ki and adapted from a screenplay by Cheon Seong-il. The film is a heist comedy film set in 1940s Korea, and stars Park Yong-woo and Lee Bo-young as a con artist and a jazz singer, respectively, who each plot to steal a valuable diamond from the Japanese authorities. Once Upon a Time was the first major investment by SK Telecom's film division, established late 2007, and was released in South Korea on January 30, 2008, under the company's CH Entertainment banner.