Anna与儿子Max来到了一个风景如画的小岛度假，这里气候宜人，同行的游客也都和善友好，他们在这里嬉戏，看海龟在沙滩上爬行，他们居住在海边的别墅里，一切看似安详，然而对于Anna来说，心中也有着难以忘怀的曾经，即使如此，她也尽情享受着假期。在小岛的另一边，一位父亲也带着儿子，与Anna不同的是，他们似乎并不是来游玩，一场阴谋正在酝酿，不速之客的来临打乱了游客的阵脚，Anna将如何带着儿子逃出这地狱般的小岛呢？

Miss Happy stars Pancake Khemanit as a happy-go-lucky woman named Happy, who often annoys her best friend Golfie (Ben Chalatit). Unfortunately, Happy is diagnosed with having an irregular heartbeat that will likely cause her death within a month. In an effort to survive, Happy looks up information and finds a YouTube video made by Tul, played by Jitpanu Klomkaew (Ball). Tul's video claims that Happy can stay alive if she dances in the way shown in the video.