The film tells the tragicomic story of three interconnected characters. The first is a doctor who prescribes happiness pills to anyone who comes his way, and the troubles that befall him as a result. The second is a girl who is normally introverted but dreams of becoming famous by posting dance videos on social media. The third is a teenager who aspires to be rich and famous by posting gaming videos on the internet.

Mysterious Message tells the story of a young woman who is trying to find her sister who has mysteriously disappeared.