In a wellness class, Diana, a charismatic coach, guides her students to the "light". Guillermo, one of her students, is uncomfortable and is later found dead in a park with an indelible smile and a flower crown. The cause: overdose by "laughing gas". The investigation reveals more victims with the same pattern. Diana, with her motivational facade, is the main suspect. Her past indicates a radical change after the death of her father. The story explores the limits of self-help and psychological control.
