With "Blue Salt" nearing its theatre release, the film's OST track, "Blue Summer Day", was revealed through both a digital single and music video! "Blue Summer Day"�was sung by actress Shin Se Kyung and male vocalist MY Q. It was also�composed by indie group 3rd Coast and written by director Lee Hyun Seung. The music video, meanwhile, was produced by director Cha Eun Taek, who's known for his work with Lee Hyori, Lee Seung Hwan, and Brown Eyes. Given that it's a song for an OST, the video also gives fans a glimpse into the upcoming film. Check out the soothing song below! "Blue Salt" will hit theatres on September 1st. Source + Photos: No Cut News via Naver