in her big screen debut. The early working title was Strawberry Milk (), a drink which Jo's character has a fixation on. It was changed to Thorn because Kim said, "There is nothing sweet and soft about the movie like strawberry flavored milk. Only sharpness like a thorn exists. It represents something difficult." Filming began on September 14, 2013, at Jijok Middle School in Daejeon. Shooting wrapped on November 10, 2013. Box office Innocent Thing was released on April 10, 2014. It drew 121,292 viewers on its opening day. References External links 2014 films 2010s erotic films 2014 psychological thriller films 2010s romantic thriller films Erotic romance films 2010s erotic thriller films Films about stalking Films directed by Kim Tae-kyun South Korean erotic thriller films South Korean romantic thriller films 2010s South Korean films