Based on the title provided, there appears to be a slight misspelling in the film name. The correct title of the popular Sri Lankan comedy franchise is "Mamath Rasaahaniya" (Miracle of Love). The phrase "Gahaniyak" (A Mystery) is often associated with thriller titles, but "Mamath Rasaahaniya" is the famous three-part comedy series directed by the late Ruby de Mel.
Conclusion
A split-image: left shows Asha standing on the shoreline at dawn; right shows Nalin mid-brushstroke in a sunlit studio. Their images overlap subtly with a painted texture. Mamath Gahaniyak Sinhala Film 3 - Www.Sirisara.info